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calculating cost of bpc invention
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watch strap
Doomheim
#1 - 2011-11-01 17:05:21 UTC
Just started inventing and I have a question regarding bpc invention cost.

At first I calculated the cost by taking the total spent on attempts and dividing by the number of success's, but it occurred to me that there was no stopping point at which I could say "this is how much they cost" since the price keeps changing as you keep inventing.

Only other option i could think of would be to determine cost according to probability of success, ie if 1 attempt cost 1mill and i have a 50/50 chance then id value the invention cost of every bpc at 1.5mill.

However, what with my maths being very poor, i am somewhat skeptical that the calculation is that simple and even if it is, is that the best way to calculate the cost?
Lady Ayeipsia
BlueWaffe
#2 - 2011-11-01 17:14:10 UTC
Honestly, your method is correct. However, you should first calculate the profit from making the t2 item. For example, I was extremely happy when I could invent an onyx. I made a bunch if tries because I had datacores I found through exploration. After I succeeded, I priced out the cost of building an onyx... I stood to lose 20 mil isk or so per onyx. No sense inventing them any more. The same is true for a heretic, where as a saber has some profit margin.

In other words, you are on the right track for calculating invention costs. Just make sure what you invent is worth the effort.
Hoohnzy
Deep Core Mining Inc.
Caldari State
#3 - 2011-11-01 17:23:43 UTC
Buy datacores for your BPCs. Do the invention jobs and divide the cost of datacores by number of succesful jobs...
watch strap
Doomheim
#4 - 2011-11-01 17:29:15 UTC
thanks lady :D oh and hoohnzy....did you read the post at all? :P
Hoohnzy
Deep Core Mining Inc.
Caldari State
#5 - 2011-11-01 17:40:04 UTC
watch strap wrote:
thanks lady :D oh and hoohnzy....did you read the post at all? :P


my english sux lol i read it but i think i havent understand correctly. anyway if you wnat to manufacture t2 items this site will be helpful www.eve-market-guide.com
VaMei
Meafi Corp
#6 - 2011-11-01 17:52:47 UTC  |  Edited by: VaMei
watch strap wrote:
Just started inventing and I have a question regarding bpc invention cost.

At first I calculated the cost by taking the total spent on attempts and dividing by the number of success's, but it occurred to me that there was no stopping point at which I could say "this is how much they cost" since the price keeps changing as you keep inventing.

Only other option i could think of would be to determine cost according to probability of success, ie if 1 attempt cost 1mill and i have a 50/50 chance then id value the invention cost of every bpc at 1.5mill.

However, what with my maths being very poor, i am somewhat skeptical that the calculation is that simple and even if it is, is that the best way to calculate the cost?


For my purposes:

T2BPC cost/run = (T1BPC cost + Datacore value + Invention lab fee + Decryptor Value + Base Item Value)*Expected Success Rate/NumberOfRuns

I no longer use a research POS (It made Eve too much like work) so my invention and copy lab fees are fixed by my standings at the stations I use.
If you use a POS, then either absorb the cost as an overhead cost of doing business and adjust your periodic profit by that cost, or guestimate the number of copy/invention jobs you'll run over a period to get an average fuel cost / BPC.
Your BPOs, towers, and modules are mark-to-market non-depreciating assets until destroyed or sold.

I only use the expected sucess rate since basing my forward costs on RNG results also seemed like way more work than it's worth. Past results don't guarentee future performance, and after enough shots at it the numbers will balance out. I keep a stock of X number of invented BPCs as a supply item for the manufacturing side of things, and value their average cost/run into the manufacturing cost of the product.

Lastly, for datacores, Decryptors & base items... use current VALUE as a market sale, not cost. Many times, you'll do better to just sell the things to someone that doesn't do math.
Tau Cabalander
Retirement Retreat
Working Stiffs
#7 - 2011-11-01 19:39:26 UTC  |  Edited by: Tau Cabalander
Average Invention Cost = Invention Cost / Invention Chance

Average Invention Cost Per Run = Invention Cost / Invention Chance / Runs on T2 BPC

Average Invention Unit Cost = Invention Cost / Invention Chance / Runs on T2 BPC / Number of T2 items produced per run

Example: ammo makes 10 runs of 5000 units and say it costs 2m ISK to invent with a 42 percent success:
Average Invention Unit Cost = 2m / 0.42 / 10 / 5000 = 95.24 ISK per unit
Cyniac
Federal Navy Academy
Gallente Federation
#8 - 2011-11-02 13:37:34 UTC
watch strap wrote:
Only other option i could think of would be to determine cost according to probability of success, ie if 1 attempt cost 1mill and i have a 50/50 chance then id value the invention cost of every bpc at 1.5mill.


Tau has nailed it. Just wanted to point out though that if your cost is 1 million per attempt and you have a 50/50 chance of invention the cost per success is 2 million (you'll need two attempts, on average, to get one success).


Incidentally I just use EVE MEEP. It works for me.