With that said, I have tipped traditional moving companies generously but that's because they lugged my furniture for several hours. With the bike shipping the guy opened the back of the truck and I did most of the work to wheel the bike out, it was more like a package delivery than anything else...
Those were my sentiments as well. I paid to have my bike shipped, and while the truck driver was a nice guy, I helped him get the bike off the back of the truck. If it's moving guys, and they are literally picking up the boxes and packing and unloading the truck from/to my house, then I'd tip. But for the bike, he was just delivering and I don't think that warrants a tip.
IMO.