[quote name='hhhdx4']just wondering, why would one, besides using a special controller like the Guitars or dancemats, want to connect a DS2 to a ps3 when the DS3 and Sixaxis are pretty much the same controller with more features.[/quote]
For multi-player games of course. I have two six-axis controllers, and instead of buying another $40-$50 PS3 controller, I found it much more convenient to buy a $4.49 adapter. It makes sense to me considering I have 6+ PS2 controllers just sitting around that I can use. Saves me $45+. The question you should be asking, is why aren't more people buying these? Same functionality (other than motion controls), at a fraction of the price.