Sounds like you were playing suckers. I never liked suckers...I liked idiots. Especially, idiots with big mouths and big egos that wouldn't allow them to quit no matter how hard you beat their brains out.
I'd rather play people that know how to play, or think they do, and then try to shoot their livers out, like Earl says.
When you are playing by the game, there are games where you may not concentrate as much when you are ahead and they may win a few, but I never intentionally laid down just to let people win.
I used to play a lot of ring games and you learn not to miss too much when you know you may not shoot again for a long time.
I made a lot of money gambling for many years, but it wasn't by suckering people. I actually had to beat them.
I use to be like you, until I was stationed back in Germany in the 80's for 3 years. Once I got all transfered in to my duty station first thing I did was hit up the post recreation center. It had 10 Brunswick Sport kings and they looked like they had recently had the cloth replaced so they played real good. FIRST person I played and beat out of any money was a guy by the name of Bennie Brooks, who I later found out was the best player on post. Once I beat him playing 8 ball, 9 ball, 14.1, banks, and 6 ball....he was done, we never did play for any money over the next almost 3 years. BUT, once everyone that played there found out I beat the hell out of Bennie and made him quit....I couldn't get a game to save my ass with anyone. BUT Bennie on the other hand, had more guys playing him for money than he ever had, and thanked me one day by giving me a $100. I asked him what the money was for, he said it was a thank you for sending him so much business playing pool for money!!! He told me no one wanted to play me....if they couldn't beat him, so they kept playing him over and over...and he just kept taking their money. I later teamed up with Bennie and would travel down to Frankfurt to find action...because I couldn't make a dime where I was known.