that's about right. some do a lot more than others depending on their opponent (FGs, AI3, PvP), and how much of elements they can fit in the day. i'm quite limited as i haves school to deal with and (this week at least) tennis for six solid hours which, believe me, leaves you very tired. it also depends on how much time you put into the forums.
50 games per day probably isn't that much. if it takes around a minute to complete a game against AI3 then in two hours you can get around 120 games going.