wolfadeus - 11:18 am on Nov 14, 2006 (gmt 0)

I don't understand your question. To me, every market is based on selling and buying, and I can't see a fundamental difference in markets on- and offline. One could similarly ask why a shopkeeper would sell his business - and just like with websites, there are hundreds of reasons for an individual to do that (right price, retirement, merging with other business, etc.)