For bass & panfish, I don't tip with bait. May use a leather trailer, but no scents or "bait-ish" additions to the material. Usually, I can't get the bite in extremes via downsizing the offering and fishing with methods which are conducive to very subtle bite detections.
When it comes to carp, drums, channel cats, bullheads, Redhorse (and any other suckers) I'll usually tip jigs with something like corn or a bit of crawler. I'll occasionally push pure fakes on 'em when possible and for kicks, but some species just plain work better with a bit of hook sweetening.
Really, one of the things I love about bass/panfish is that I don't need to bother with bait and all the trouble that goes along with it. Worth suffering it on some species due to necessity, but I hate to waste a good piece of crawler on a fish that will eagerly eat vise creations.
There's a bit of satisfaction one gets when successfully tricking fish bait-free in adverse conditions and it's even worth risking a potentially lower catch rate at times. For me, anyhow, but it does depend on the species. Sometimes 10 kernels in the water and a plain yellow chenille jig is all it takes to seduce ol' whiskers. I consider this to be "half baitfishing" as opposed to tipping. Mighty fun, too...and watch out for the carp!