[watty]

You can with card counting (and you'll get kicked out). Even with perfect rational betting the house has the edge.

[a1k0n]

Perfect rational betting without card counting is to not play at all, since the house has a ~0.5% edge on a fresh deck (depending on the exact rule variations).

[jayruy]

im talking using card counting to inform rational betting http://en.wikipedia.org/wiki/Kelly_criterion