Suckin' wheels

I did the 100K Firecracker Ride this morning in about 3 1/2 hours, thanks to the people in front of me. As I rode I saw a few other folks I know but no groups I'd ever ridden with. So I'd catch the end of a paceline, let them tow me along in their draft and then move forward to another group when the line came apart. This is a very rude way to ride, but I did it anyway. Some of the pulls I got were incredible and I would've been happy to reciprocate but I was only allowed the front a couple of times. Anyway, when I got home I was comparatively fresh as a daisy. Lesson? If a solo stranger can catch your line, let the stranger pull when his or her turn comes.