I had a Mac. Matter of fact, I've had several. From a G5 Power Mac to a 2012 dual 6-core Xeon Mac Pro. But Apple doesn't support Nvidia cards, which I need for my software. While I was able to modify my old Mac Pro to fit one in, the 2013+ units have no ability to install anything but the included, already out-of-date AMD video cards in them. And after waiting a year for GTX-10x0 support to come, I gave up and sold my Mac Pro and built a new rendering monster that does everything I need.
It seems Apple doesn't give a wet fart about power users anymore. But their competition is more than happy to roll around in my money like little piggies.