That's peanuts compared to the 15-30% of salary a recruiter will charge
If they had metrics proving out the number of devs who look at the board, and the number hired through the board, that would be a reasonable price. But as far as I know, this board could have been set up last night, with jobs scraped from other sites. I can't spend $99 on every job board that exists. I need to choose the right boards.