It's akin of buying a really sweet deal on the AH, except whoever posted that sweet deal really botted to get the item, and now you got a nice hefty 72 hour ban and the item taken away from you for botting.
Not really the same thing but I think you know that already.

The buyers shouldn't be penalized for something they took no part in -- if they bought a team, play the games LEGITIMATELY, and win/lose according to their own skill... then they shouldn't be looking at a 72 hour ban + all gear removed... for the entire SEASON.
I'm sorry but in my oh so humble opinion, there is nothing "legitimate" about buying a highly ranked team, then playing the minimum amount of games per week to leech as many arena points (resulting in gear) as possible from the purchased ranking before the team rating "rights" itself based on the skill of the players on that team.

Regardless of whether blizzard says it's ban-able, it's certainly not legitimate in my opinion which is why I have little sympathy for those caught up in the fact that it would seem such activities breed cheaters who wish to maximize their own profits.

I think with the changes coming in 2.4.2 it could be assumed that Blizzard doesn't find points gained in such a way "legitimate" either, even if the practice of getting points in such a way is not a ban-able offense.

Again, this is all my opinion ... feel free to have your own.