Correct. I got lucky and cashed out before the "math" caught up with me (not the math police). Over the last SEVEN (updated to include my quickie visit this week) visits to casinos I did this with free play. And even at Caesars Palace with $1,000 that I took out on a marker I cashed out with more than a $4,500 profit after I paid off the marker. All the while I was playing negative expectation games.
People win on negative expectation games. Deciding when to quit because either you've lost enough or won enough is what determines winners.
This reminds me of a great lesson I once learned at a poker table. An experienced player looked at me while I was wrestling with a call and said "winners fold too." It was good advice. I would have lost that hand.