Why do can good/tight poker players play -EV table games?

[NickMPK]

T.J. Cloutier, obviously a great tournament poker player, has a reputation for being one of the more tight/solid pros, but is also apparently a massively degenerate craps player. I have heard similar things about many other successful poker pros.

I don't understand the psychology here. I can see the appeal of table games, but how can someone who is so attracted to -EV gambling put aside this proclivity when playing poker and not be tempted to make -EV calls just to gamble?

And on the flip side, how can someone who is disciplined enough to fold poker hands for hours on end not have the discipline to avoid losing all their poker winnings at games which are obviously -EV?