I disagree entirely. There are many highly rated content providers that offer rates like $1/100 words. I'd like to see you bust out 10,000 words of content that meets the research / copyscape / editing / grammar guidelines that many of the buyers on this forum expect in "a day, easy".
The same can be said for other services like bookmarking or blog commenting. Many of the service-buying members here expect services like this to be very cheap thanks to the huge boost in service providers from countries like India. Why make someone do 10, 20 or even more orders basically for free just to get their thread posted? That's a little absurd.
$40 or $50 per thread is just fine. If the provider sucks, they are going to suffer negative reviews in the thread that they paid for, and their thread will sink. It's enough of a cost hurdle that these fly-by-night providers will think twice about posting, and prohibitive enough to prevent multiple thread spam with the same provider selling the same service through multiple accounts.