c-bets and the gap concept

[chicheebee]

here's something i'm having a bit of trouble with. most people seem to advocate c-betting against one opponent a large majority of the time (typically 75-100%), regardless of whether the flop has helped them at all. sklansky's gap concept tells us that we need a stronger hand to call than to bet. it follows, then, if we're betting almost all flops that we should typically expect to still have aweaker hand, on average, than our opponent on the flop. since our opponent, if they're even slightly observant, should be aware of this, i'm slightly confused as to how this can be profitable.

sorry for rambling, hope this makes sense