If it's a free market, then on an equal basis, I think we have a right to free speech as well.
Our comments need not be scathing or abrasive, but in all fairness, we should be given a right to air our views as well in this 'free-market', just as the TS is free to state whatever terms and conditions he or she wants, and for anyone to feel free to take-up or reject it.
It would be entirely different IF the TS has paid an exclusive fee to advertise, and part of the exclusivity is that no one is allowed to speak freely in the advertising thread.
Considering that freelance or part-time event photographers rates' go anything from $80 - $150 / hr and one professional's rates can go as high as $500/hr with conditions, it is my opinion that $150 for 9 hours' work ($16.66 per hour) is way too low to justify requesting for a 'photographer'.
If the request were for a student, hobbyist or beginner who wants to gain experience and with no professional obligation to deliver quality, or something along those lines, such an offer seems more balanced with the attendant $16.66 being an 'allowance'.
These are my opinions.