Hard at times I suppose, but if they're not professional they won't get follow-up work...
There is a reason why there are so few actual "paying" photographers.
Think on this... The photog is going to sell the photos to magazines and other websites or what have you... Those guys PAY.
If they aren't paying, then the odds are they are using the position as photographer to attempt to take advantage of people. I have seen it many many times.
Lots of skeezy dudes being "photographers" out there.