Betfair?
No - I seriously doubt anyone would play those limits. I know I wouldn't!
Casinos you mentioned:
Bet365 - great for players, but not for affiliates because they have Negative Carry-Over

iAffiliates - If I'm totally honest, I don't trust them 100%.
Casino Euro - Play there myself (and promote them) - nothing bad to say about them!
Have a look at Microgaming casinos - their Roulette is among the best IMHO, and they are nearly ALL trustworthy for players & affiliate alike!
(Not CR though)
KK