If you live in Toronto (as DN did during the 10/20 years) the biggest "legal" game you can play on a day in day out basis is 10/20. When you move to Vegas (or AC) you have so many limit options you can progress faster, and (although the pros and semi-pros are all over the place) there is more dead money in the pockets of spend happy tourists. I think DN has alluded to the fact that the 10/20 game he was playing in befor he moved south was a very tough game to beat.