My first ever trip to an online casino (actually a games room on Paddy Power) I won £1,700 playing roulette without a bonus. At that time I'd never heard of bonus bagging or matched betting and I'd only ever placed 1 bet in my life.
Paddy had an offer of place a £40 bet for a free football shirt so I did, it won and I got a free bet which I placed on a triple accumulator, which won for £106 profit. I withdrew my £40 and went to play roulette with about £150. Walked away with £1,850 an hour later (Was up at £1990 at one point and couldn't make the extra tenner)