CPA is a bad deal for affiliates most of the time.
This is a typical example of it. You lost a nice player because of CPA rules. On rev share you would have done well with him.
Not sure about poker, but in casinos many times a player will deposit like $20 the first time just to get a feel for things. Could be a super player after that, but on CPA you will never know.
If you got to do CPA, go for a staggered model, x$ the first deposit and x amount the second one….