If you are already in four leagues (S3SL, SBSL, TSSL, TPSL)? If so, and you want to join this league, there is a simple requirement to do so.
a.) Create and submit an article of high enough quality that it is accepted and posted for all to see, one article a month. (Again, it has to be accepted.)
b.) Create ten threads monthly in any of the team forums or baseball forums (ie non-sim league forums and non-community forums.) The threads have to be more than copying and pasting an article, but something of actual effort and would have the potential to stimulate discussion (basically, something semi-smart and in your own words.)
Why do we have this requirement? Because there is a reason why this site has a considerable amount of money invested into it and it's not so you can sim to your heart's content. I created the first sim league here about four years ago and while I wanted to bring my enjoyment for the activity here, I also wanted it to benefit the forums. Neither of these requirements are difficult to meet and if you meet them, you are in the clear.
If you want to go ahead and drop another league to bypass this, feel free, but don't be surprised if you aren't able to access the leagues for awhile. Do I personally care that much? Nope, but it sure is not fair to the other commissioners here who work hard on their leagues and some of whom have a hard time maintaining a full league. So if you want to quit for this one and bypass this requirement, you would be best off waiting awhile to a less obvious time.
If this does not affect you, do not post here. If it does affect you, continue reading.