This is what we have always done. When my DH and I have gone to other resorts (sandals, where we had a different on each day), It just seems the right thing to do. Besides where would you put them all. It's cute for a while but then it just becomes clutter after a bit. They also tend to collect dust.
That was my thought, as well. Not to be rude but why would you want to take one home, and what would you do with it once you got it there? And it just seems like a terribly bulky thing to pack in a suitcase. My wife kept tickets from a 1999 trip but they take up this "" much space. I have no idea where she'd stuff a towel animal never to be seen again!