Okay. So that is strange. Here is what I know.
1) The limit used to be 4.
2) There was a bug filed telling us to raise it to 6.
3) I was pretty sure that had been done, but I didn't see any notes or changes to documentation that would *let* you guys know it had been changed to 6, so until I confirmed that for sure I didn't want to say anything.
4) I'm quite sure that it shouldn't be 7.
So in summary:
I'm pretty sure you can now have up to 6 with no problem, but haven't confirmed it myself.
I'm pretty sure you aren't supposed to be able to have 7, so if you somehow do, I'm not sure if that is going to cause problems.
Guy with 7 teams: do you mind sending me your Yahoo ID (NOT your password) in a PM? Might help me figure out what is going on.