I'm sure I probably am BU, so will be prepared for the pasting I am about to receive. 
A large group of friends do a gift swap for our DC for their birthdays. Everyone buys for another child, keeping costs down but means all children get a gift. Budget isn't much, but we all agreed it's the thought that counts and gifts don't need to be flashy. Every year we have a mass gathering and swap and open the presents. More fun that way. The children have fun, play with their toys together, parents catch up, and it's all lovely. Less pressure on parents to buy a gift for everyone, etc.
This year my DD was given cash in an envelope. AIBU to think this goes against the spirit of the thing a little bit?
I felt for her as all the other children obviously had new toys that they were playing with and she didn't. She's one of the youngest children in the group and a bit young (not long two) to appreciate cash in the way an older child would, it probably wouldn't have bothered me in the slightest if she was older and more aware of money and it's value etc. We obviously were enthusiastic about it and told her it could go in her money box, or we could buy a book or toy with it etc. but it just niggled me a little bit and wondered if others would feel the same?
Not something to lose sleep over, I appreciate (I haven't been), but what would AIBU be without people's petty grievances? 