If you had a win limit of say..1 or 2 wins per day..depending on how many auctions you are running daily....those who already win 2 items that day wont keep bidding on everything else. If newbies are coming to try your site, its a real turn off to see only 3 or 4 auctions running, one person winning 2 of those and still power bidding to win the last 2 items.
As of right now, no one has won three auctions. Some have won 2 in a row, but no site even has a 2 win limit.
We just opened, why would we have 30 auctions?
Many sites have a 2 win per day limit....and they also add a weekly limit. Just gives more people a chance to actually win something.