This was possibly the stupidest promotion ever. If the Dividend Miles promotion department reads this message board - do not repeat HSJ. You get a few people that game the system to the detriment of others that spend real money on you airline.
One of the benefits of flying US instead of UACO and DL is the relatively low number of elites - with higher upgrade percentages etc. It makes little sense to dilute this benefit to sell a few seats CLT-BTR.