LoL players do the same too, the best teams are in houses too.And what of DOTA 2/SCII players who do the same? I know some Progamers who practice up to 12 hours a day in their team house, prepping for tournaments.
Difference between the 2 is that LoL is bigger, and more centered around eSports. Riot invests more in eSports than Valve it seems, I'm sure they are the thriving force in this Visa story!