What do you say about this? Someone who would be interested in this here?
I see it this way:
-Mysterious box with unknown amount of BUCKS in it . (maybe more than one box?)
-Fixed bid increase for everyone.
-Highest bid wins the Mystery box + his bid - fee for the site (25% of the bid)
-All losers get their bids back -0.0001 BUCKS
This is the only way that thing may work.
Stays fair, quite clear and I think attractive.