I played online during the first two years of university. After losing my initial $50 deposit, I devoted some time to strategy before depositing another $50. I started out on SNGs before moving to 50NL with around $400 (lol bankroll management). Games were soft and I was a half-decent fish on a heater, so I ran it up to $7,000 and was splashing around in 200NL. I took a couple of shots at 400NL, but that went badly, and I gave more back when I moved down again in stakes.
I eventually cashed out $2,000 and never played online for real money again. That said, I've always maintained an interest in the game. We play an occasional tournament at work, which is just easy money.