If you do not post on Scikotics for a couple of months they are supposed to kick you down to "Groupie" status. Continued inactivity should result in being banned. Why you were banned outright is speculation.
We here at XDForum don't have posting minimums, but it is nice to hear from you now and then. Like they say over at Scikotics; "Inactivity kills the club" Although this is a forum and not a club, I agree with that statement.
This forum is quickly becoming, or has already become the "Premier" Scion xD site. Wiith no dilution from other makes or models, all members here are totally all about the xD! Posting often about your car, or issues directly relating to xD's will only serve to strengthen this forum. Many of the members here are quite passionate about their cars, and post often. We all hope you will as well, and are glad to have you as members!