I never really made a concious decision to get a bike, I just accepted it as something that happened when I was 16 (but after my GCSE exams so I didn't get tooo distracted)
However whats kept me into bikes is the people, and the cheap insurence. And the fact I can't pass my driving test.
Aso, my parents met at a bike club at university, so if it wasn't for bikes I wouldn't exist!