Forcing sellers to drop their prices? Not sure about that but how about a maximum amount of bumps? Say 10-15 bumps? That would cure the multi-bumpers and would make each ad good for about 2 weeks for daily bumpers.
After which the ad will still be there but become unbumpable. The seller gets a chance to get the price he wants, no matter how unrealistic, and we get fresh ads on the first page of the sales forums?
EDIT: To keep track, there would be need to mark each bump with a number I guess. Anybody violating the rule would have their ad deleted?
Example: "1- Bump' or whatever you want to say AFTER marking it with the number
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