My brother only bets the NFL & never caps & won 20k last season betting only parlays. He doesn't have years like this every season but goes to show you that you don't need to.
I on the other hand think capping is needed to a certain point. What you don't want to do is over cap a sport/games & then your head is spinning. Always leave yourself doubt that you could be wrong about the side that you want to bet.
He who admits they know nothing, admits they know something about everything & he who admits they know everything, admits they know nothing about what's going on.
I myself know nothing, in fact I know less than nothing, if I knew i knew something, that would something, but the fact that I don't know anything suggests I know something