The replies to the OP are unbelievable.

Does shooting stock make photographers a) mean b) masochist c) bitter d) all of the above?

Other than the letter was a quote, so don't shoot the OP? 

d) All of the above (and more)

We've been lied to, cheated, had income cut after promises, treated poorly and fed pure BS from time to time. I think that makes people, angry, bitter, mean, and leads them to distrust the agencies. Those who continue must be masochists or at the least, some kind of addicts? Who else goes to work, hating the place they work, the people they work for, and put up with miserable low pay as a reward for their personal efforts?