Because of this, I made a lot of money playing slots.
So, you actually did make lots of money playing slots? For me it is just something unreachable, because I don't get those slots games and I don't see any strategy behind it. I never managed to win more then 17 dollars, making small bets and hitting small multipliers. I know that those huge wins we all have heard about regarding casino gambling are most often made on slots, but this is something completely closed to me, apparently.
It can happen, but not on a regular basis. I highly doubt there's a winner in slots who keeps on playing and is still a winner now, using only one online casino. That's impossible. It takes a lot of money before they give back, and most slots are high-volatility games. 200 - 500 rolls before something will come out, and even buying the free spins is not a good choice either.
It's more believable if a gambler says he won big in slots and is still a winner because he never went back to play again. I know some people who did that.