Different opinions are different, so I'll end with this.

If there was nothing wrong in Blizzard's eyes with points/team selling, then they wouldn't be making so many changes to make it much more difficult in today's patch.

We can argue all day about the semantics of what's a ban-able offense and what is not, but the fact remains that Blizzard is making changes to make it much more difficult or next to impossible to effectively buy arena points or teams.

In my opinion, that means they want to actively discourage the practice and since they made the game and the rules, I'll also assume that means they feel is it not a legitimate way to progress through PvP content (just as when they make changes to instances that previously allowed people to bypass PvE content in certain ways. It wasn't ban-able, but it was fixed because it also wasn't legitimate progression.)