Haha, I literally just came back from my offline game (there were dragons and tequila shots, so forgive me if anything is unclear).
TED is right, 7 players is pushing it, and I expanded it to 8 for a few reasons: I want this game to be as open as possible; I expect a player or two to be inactive for long periods of time, or drop out altogether (not a dig at anyone in particular - that's just how games usually work. Life gets in the way & such), so having a large party can compensate for that, and there's always the possibility of needing a temporary or permanent replacement; pbp is by nature a bit heavier on the RP aspect - players can talk amongst themselves without needing direction or input from the GM.
Usually, parties are 4-5 people, so if there's enough interest, it would be easy to split the group (and TED, if you're serious about GMing, I'd love to play).