I purchase photographs when possible, several from people who frequent this forum. New work I purchase goes up on my print viewing wall for awhile along with my own work. I leave my own work up to see how it holds up after living with it for awhile, many times it turns into " what the hell was I thinking"! I rotate work by others only because of limited space.
I think it was Fred Picker who made the comment that is was amazing how people that claim to love photography will spend hugh amounts of money on equiptment but would never consider purchasing a photograph.