You seem to have confused them with realessays.com - these are two different sites.

Some of the sites out there do specify that their writers are required to hold a Master's degree at minimum. However, I am unsure how many of them would actually impose their requirements when selecting their new writers.

Well, I have recently ordered a small (3-page long) essay on Political Science with them, and it looked rather professional. I don't know whether they have a lot of writers, but they certainly appear quite respectable.

Yes, I have encountered the same situation when I once tried to order an essay at their site.