I looked into this program with USN also because I am very interested in the possibility of owning and operating an independent community pharmacy, but the reality is that having your MBA in addition to your Pharm.D. will most likely only benefit you if you are interested in pursuing a corporate level position with one of the retail chains or a drug company.
As far as getting a job simply as a staff pharmacist, it won't increase your salary or really even make you more attractive than another candidate. The only skill a retail employer is interested in is your ability to perform as a competent pharmacist, exclusive of whatever other business knowledge you may have amassed. A pharmacy manager position isn't going to be offered to you over another pharmacist just because you have an MBA either.
If you're looking to pursue a position like the DOP of a hospital, then maybe the MBA might help a little, but if a hospital admin position is your goal, you really should be worried about getting your MPH rather than an MBA.
The business knowledge gained through an MBA program I think would definately be useful if you owned your own pharmacy and had to deal with a lot of the business aspects that most retail staff pharmacists never have to worry about. That being said though, I work for a pharmacist who owns a very successful independent community pharmacy with no real business training, just a lot of passion and determination.
So no doubt, getting your MBA in addition to your Pharm.D. would be a great accomplishment; but if it doesn't really give you any advantage once you graduate, is it really worth it? ...good luck on your decision.