I agree with the advice to hunt the routes into and out of the area being damaged rather than hunt over "bait". And don't forget that deer are very nocturnal. I suspect that is what is happening in your case. If you have a trail-camera, try setting one along the trail into the damaged crop. Might answer a lot of questions ?

Don't forget 90% of deer hunting is being lucky enough to be in the right place to see a deer, the other 10% is what you do after you see it. There is a lot you can do to make the odds of seeing the deer more in your favor. Hunt the fields that they are feeding in, stay still, control your scent, etc, etc, etc. I don't see why your putting a bait pile out, you have fields of bait if it's a crop damage tag. Find the fields their feeding in, find their routes in and out of the field and set a tree stand a little bit into the tree line near their ingress and egress points.

Scout the cornfield and find out where the deer a traveling. Where you are hunting is more than likely a nocturnal portion of their trail. Look for other trails in the area. Hunting the crop doesn't necessarily mean that you have to be in the field, but even if you were, you still might not see anything. If you truly want to get better and learn something, sit on the field and watch the deer and find out what their pattern seems to be and then walk the woods to see if you can figure them out. That's what I do before season, and what my old man does as well. I don't have any trophies, but he's got enough to prove the method.