Definitely don't get an MBA if you're not actually interested in learning the material covered by the program.

I also didn't get a pay raise, and I didn't use the connections I made, but learning the material was extremely helpful: market forces, positioning, statistics/analysis, strategy. I still skim email newsletters I get from McKinsey & Co. / Wharton a few times a week, and HBR has some incredibly good articles every now and again.

Source: C++ developer with MBA in marketing.