RW, I believe that too. I think that a lipless crankbait will draw fish in with it sound, kinda like how the swimbait guys in California move fish around a point to get a perfect angle.
KMS - Just another thing to think about, a lot of times you can use the lipless crankbait to catch inactive fish. It's an excellent reaction bait and if you put it in front of a big girl and give it a pop, they will hit the bait 9 times out of 10. I was out fishing yesterday and the fish wouldn't hit anything, including a c-rig. I pulled out the trap and started ripping it through shallow areas where I though the females would be sitting before they spawn, and everytime I would hit a clump of grass or wood, I would rip it, and a big fish would load up.
So basically, don't just think it catches actively feeding fish, because if you use the right retrieve, it will catch fish in a negative feeding mood that even a worm might not catch. ;D