The thing is, if you are heavily tied to Adobe products, paying $50/month to ALWAYS have the latest version is actually a good deal, from a usability perspective. Adobe likes to change/abandon file formats with every upgrade, and that causes issues. If you always have the newest version, you don't have to worry about that.
You're right, though: Adobe has no competition. But that isn't Adobe's fault. For all the screwy-ness of Adobe's software, they are STILL better than any of the alternatives, and basically always have been. They "won" their market legitimately.