When gambling, setting limits before the session is important (atleast for me). If I deposit 10$ for example, I quit if I lose, and I withdraw if I hit 20$. That way is easy for me to keep in control, even though I very rarely gamble.
What will you do when you win $2? you will keep on continuing even when you feel that you keep losing until you got $20? that is just silly. Most people dnt know how to stop therefore they keep on losing everything in the end. You should atleast take that $2 away if you win it as no one win in the long run as long as it is EV-