I guess it depends on how much into the sport a person . For me, it's only a recreation not a lifestyle just yet , sure i do like mtb'ing but i wouldn't call it a lifestyle .
There are those that really do get right into it buying magazines, treating the owners manual as a bible,building up their own bikes with all the latest bling. Not that there is anything wrong with that of course for those types it might be a lifestyle choice,
So for me at this stage, it's a recreation.