Photography is a side business for me, so while I don't necessarily depend on it as my sole source of income, I do take it seriously and approach it professionally. I've dealt with this situation a couple of tines now where a potential client will ask me to work for free. I always try to politely, but firmly, explain that working as photographer is a business for me, and that due to my investment in time, education, equipment, labor, travel, etc etc, working for free or "exposure" is simply not a viable option for me.
I don’t want to be rude, but I do feel like oftentimes the people who ask this question know on some level that this is bad etiquette, and ask anyway. I’d like to shut that down. (For people who genuinely mean no disrespect, and truly have no I’ll-intentions, I am more that happy to gently explain things and offer them some grace in the matter.)
I'm basically looking for a go-to phrase/response that politely and professionally, but firmly explains that I do not work for free, and does not leave an opening for further discussion on the matter.