Possibly if the bitcoins had been held for a year prior to buying something with them then it could be argued the things bought are capital gains rather than income.
Re an auction site, there are probably laws about auctions, a law firm in the jurisdiction it is to be operated in should be consulted, also the laws where each customer lives might also need taking into account.
Basically it would be a full fledged "startup", so probably need a "totally puts his entire life into it" founder and a team of co-founders willing to work overtime and weekends for a few years for shares to get it started up then hopefully be rich enough to retire when the site is sold to quibids or google or who-ever for millions or billions, along of course with all the personal data on its users that its privacy policy pretends will not be given or sold...
-MarkM-
I think the goal is to help stablilize the exchange rate by providing a monthly weekly profit. This will do that. They cannot trace which coins were used so they cannot undo the transactions, but they can shut the website down if it gets big enough, so I would bet we wouldn't see that for a long time. In the mean while we would benefit from the profit it brings in. Just like all the other bitcoin sites allowing exchange of bitcoins for goods, im sure some of them are just plain old websites with a web wallet too.
Im sure it would get duplicated but yea the original one would be popular enough at that point that it would be generating profit right? That's the goal? Also we would have funding rather than the competitors which would be a private venture and the person would have to risk quite a bit to get it up and running him/herself to justify any potential profits considering that we would be a direct competitor with a community behind us.
For those who still are thinking, why the heck would I go to this auction site when I can go to quibids.com or any of the other auction sites? Well that market is big, but we are after a different market. We are after the crypto-currency market and actually we really care about the devcoins mostly, as if you are paying via devcoins you must either earn or purchase them, directly benefits all of us who hold. Those who hold coins and cant spend? Well we all know that the biggest issue is there is nowhere cool to spend coins on... this tries to solve that problem. Other people from other crypto communities would come in and try to emulate us, but I think we would be good for a while because we would have developers willing to make features etc for coins, we already have a bounty process thats probably better than most other coins and is giong to get better. It serves the purpose of devcoin well, any business that any competitor would emulate we should have market advantage only because of the share system. If we leverage that we win.
I think of it this way, in the worldwide marketplace for goods vs crypto's there are bids and offers for goods and we are essentially giving very low offers for the same thing that another one gives higher offer, the buyer will come eat up our offer first, like for example if vircurex had an offer alot lower than crypsty, it just takes knowledge that vircurex exists(marketing), and to check it and transfer the coins if its a big enough difference.