Well, it is not really efficient, but gives some reps (tried two days ago, only 41 reps :-) ).
I have, for example, 50 question where I had accepted answers. And 101 reps, because each accept gives you 2 reps. Then I offer 100 rep bounty (or lose this rep by some other way, e.g. downvotes), unaccept and accept answers again. I am again at 101 reps. Yoyo!