A lot of the value of calling SC type hands comes from being able to semibluff with decent equity with a flush draw (and to a lesser extent, a straight draw). You rely on being able to win without a showdown, and occasionally luck out and win a big pot when you screw up. You also make it more likely that you'll be called down when you hit your overpairs/sets/etc. In games where people are never folding, you actually need cards to win. Your overpairs/sets/straights will be called down anyway and your semibluffs will too.

Trying to learn XXX cheaply in a low stakes game where XXX isn't profitable against opponents who you would never see in a high stakes game doesn't really make a lot of sense. Play the player, not the cards. It's what a high stakes player would do.