I don't think you should be able to bid on something you already have.  The driving up the price on what you already have is chump with a capital HUMP.

I do think the DKP system is fair and it works.  We reward those who attend which is what we want.  If you attend off and on, you'll accrue points more slowly but each of those few runs is never wasted as DKP does not decay like honor (boooooo).

I don't think you are screwing another player if I bid on something you are bidding on and it drives the price up.  If I see some use for an item, but know you would get MORE use out of it and want to drive you to bid more, I may end up wasting my own DKP on something I didn't want as badly as you did.

Sometimes the person trying to drive up the price ends up holding what they didn't want.  And in the end that means they're missing out of something they REALLY want (As long as the bidder doesn't go, &quot;You bid 17?, ok then I'll bid 18.  I won it?? uhh, i take that back...I didn't really want to win it).  It all evens out in the end in my view.