If you have foolishly built a Mac app that does any kind of number crunching, your choices are the newest Mac Pro at whatever absurd price Apple asks or breaking the law with a hackintosh.
Apple has been making moves that look like abandoning the Mac Pro for a while now. It's been three years where the only upgrade has been a chip update forced on them because Intel stopped making the old ones.
If you're thinking of making a video processing app or scientific computing app or any other app that really likes a lot of CPU you should plan your Mac version with a generic unix back end and communicate over the network. Apple is not supporting the market, anymore.
I guess that applies to anyone who wants something other than a phone or tablet. Unfortunately all the other manufacturers have abandoned the mid-range desktop and laptop PC markets even more thoroughly than Apple. I'm still amazed no one else but Apple sold a laptop with an acceptable screen at all for four straight years until 2012.
