If I play 50% of the hands, what is the expected loss?

[Insp. Clue!So?]

For 50, 75 and 100% hands played, and assuming on the flop and beyond you play reasonably, what is the expected loss in terms of small bets? Just curious if anybody has any idea.

For example if I play the top 3/4 hands (75%) pre-flop in a 1/2 holdem game, and then play normally thereafter, would my avg. loss be 15 cents or thereabouts, or much more, or much less, or what? Any ideas appreciated.