PROVIDING FREE SERVICES FOR BACH ALUMS?!

Just wondering- has anyone here ever worked with a bachelor alum to provide a free service? I’m a small business owner, so I know that sometimes you have to work for free to get exposure and it has helped me greatly in the past. However, I want to value myself because I know this person can 100% afford my services (which is a luxury service). I want to keep what I do and who she is private for anonymity’s sake so yes I’m going to be vague but this person approached me and asked me to provide my services in exchange for putting me on her Instagram for exposure. I’ve never been asked that before and I was just wondering if anyone has done this before and if it was worth it.