What I am about to say is true of VMWare as well, so this isn't specific to Parallels. Why? Simple: subscriptions. I have older perpetual pro licenses for VMWare, and after getting another bill to renew from Parallels, which was over $100, my old fully licensed version of VMWare looked really attractive. I've continued to use it for professional purposes with no issues whatsoever. And for the Parallels staff, don't forget that Virtual Box remains free and well supported. In a nutshell, stop trying to get me back to your product until you can offer me a professional license that doesn't require renewal.