Just a silly question...

Hey guys, I'm new to the forum, but I've been lurking for a while. I run a small automotive photography account on Instagram, and I've been seeing that many people offer free photo shoots for exotic cars. I just wanted to know, have you ever taken up an offer for a photo shoot? If so, would you be willing to do more? If not, what is unattractive about the offer? I realize that not everyone wants their car used as a photography model, but I'd like to hear some honest feedback. Thank you for your time!