I'll admit I've reconsidered my willingness to take others photos recently. My wife and I were in a cruise two months ago and there was a couple trying to get a nice sunset selfie. I offered to take the picture for them and it turned into a 5 minute photo shoot. She wanted this angle and that. She wanted her stupid stuffed animal in it. She didn't like the location, or angle. I was too nice and just did what she asked, in part because I wanted to ask her to take our picture too.
I was a little annoyed, but also was laughing inside at how ridiculous she was. I was very surprised someone would take advantage of another like she did though. I offered to take a picture, not do a photo shoot.