Wave is one of those who try to make more money off existing users while some need to make more off new users. It's odd at times when a new license costs less than the WUP. Gold/Maxx is a $119 WUP. Their loyalty is mixed. Nice deal on upgrades but so so on WUP. Even at half off I'm not sure I'd go for it.
Their restrictions to one machine is getting outdated. I have iLok software you can use on 2 machines. Yup just what I want to do is use another USB port with a homemade dongle.
The license friendly developers are Izotope, Melda, and IK. I never have to pay for an upgrade on Melda. Their plugins are rocket science but they don't crash and never get rejected by a DAW.
They have the largest inventory and I imagine something like Waves Central is their only solution so far to handle it. Some had issues with older versions being removed or new plugins not recognized by a DAW.