For points, yes. You most definitely can do this. In fact, this is why people are selling arena teams. They start a 5, bring it up to a 2000 rating and then sell it for a few thousand gold. Of course the risk here is that you may end up losing more than 100 points for those 10 losses. It all depends on the teams you face and they all won't be up in the 2000 stratosphere.

On the other hand, if you're going to do this to buy the S3 should and weapon, it won't work since those rating requirements are based on your personal rating, not the team rating. So you'll start out with a personal rating of 1500, but if you keep losing, you're going to drop a lot in the personal rating.