Assembly Hall

With so many people complaining about how the new bounty system works I had a thought.
What about two options when setting a bounty.

Bounty payout
and
Duration

Duration would be a multiplier.
Say you placed a 10mil bounty on someone for a 1 day, it'd cost you 10mil.
Say you want it to last a week, it'd not cost you 20mil to place the 10mil bounty.
Want it to last a year? sure, but it'll cost you.

After the time out the bounty expires and no one gets the isk\it defaults back to the person who placed it, like with buy orders.