Huntinstuff and Sjemac have got it about right. I can't imagine the patience one would require to try and get a wolf at a bait, UNLESS, the wolves were living off of garbage, or man put out food, and were not really wild wolves.
Probably some of you people will now declare open season on me, but here goes. I participated in the great wolf control (poisoning) program in central and northern BC, in the 1950s.
Thus, I know something about wolves, including baiting them. Our baits were always dropped well out from shore on frozen lakes. When the wolves came they always took the bait. However, it could easily be ten days before wolves showed up, then there may be ten dead wolves lying on the ice!
However, when we chased wolves from a moose they had freshly killed and only had it partly eaten, they wouldn't come back to that kill, after the carcass was poisoned. It wasn't the pison that scared them off, because they regularily took the poisoned baits dropped to them. It must have been the presence of humans at their kill that scared them off. But what the heck, it wouldn't take them long to get another moose!