You'd be amazed at how many people don't do the math. They'll either make cuts every so often (10-15 minutes) and realign, or they have bad enough ears that they align once and say "It's perfect!"
I had one U2 recording I released, an IEM feed, and somebody tried to time align that with a really good audience recording. I had already done this, but just hadn't released it. During one song in the audience recording, there was a half-second data packet drop from an SD card skip, or something like that. I had to zero in and identify it, and make the appropriate offset. The other dude just aligned it once and said "oh it aligned perfectly! it sounds so good!"
Thankfully he doesn't destroy recordings anymore and has basically disappeared online.