With writing services, it depends on what is being written. I'll reference my
Marketplace Topic as an example. One of the options in that thread, is me offering writing services to those creating a forum or who owns a forum. Depending on the difficulty of the task of the individual rules, guidelines, or other topics that they would need, my writing rates start at $25.00 USD, and increases, based on level of difficulty. Basically the charge is based on how much time I believe it will take me to complete. The higher in difficulty items will take time to write, so it will end up charging a bit more for it.