My daughter is almost 20, and when she was 3 the phone calls starting rolling in with requests from local modeling studios to have my daughter model, try out for TV commercials, etc. I said no. I had one mother yell at me because of my refusal to let my daughter participate and for the opportunities I was keeping her from, but it was a choice I made as her mother because I thought that it was best for her as an individual.
Same here in that we had many an offer for commercial work but out and out refused for the same reasons of not wanting DD to lose her childhood. We still get comments and offers but would never consider putting my child down that path.