As far as the spleen goes, they are indeed incredibly lenient compared to any other private tracker. There may have been one SW related purge, when they also stopped handing out invites for SW, but mostly they just delete inactive accounts. That tends to cover the people who just grab a SW release or two, because they never log back in anyway.
Myspleen is the only private tracker I know of where you see a user talking shit about a release in the comments, click their name and see they’re a member of two years with a .02 ratio. 😃
That said, I’m all for telling new invitees that they need to seed, which I believe is how this discussion started.