Yes, as I said above, most of the CAD companies are not content with charging you an arm and ten legs for their CAD application, they also expect to charge you an ongoing premium for "support" and get quite irate if you don't pay it. The sales managers are presumably paid on the basis of how much "support" they manage to "sell". If you have several seats, it was never obvious why you'd need "support" for all of them, so we would often just pay for "support" for one seat. That irritated the crap out of the distributors and it would only be at the end of the year when targets had to be met that they might deign to allow you to resurrect any licenses that needed to be updated. Generally speaking, the main benefit of "support" was the opportunity to upgrade to the latest release. Of course, when many of those releases were bug fixes, you question the value for money "proposition". The more bugs in the code, the more reason to pay for "support".
It wasn't just mechanical CAD but PCB layout too – they are all at it. And as you may have noticed, even the likes of Microsoft are selling effectively renting thei software now, so you buy (subscribe to) Microsoft Office 365 with a defined lifetime.
Partly in response to the exciting prospect of the end of ownership and easier new revenue streams, we are already being trained that we are simply borrowing or renting software. You can see that in the wording of the agreement from Autodesk.
One of the logical extensions of this policy is the new business model being pursued by Onshape (3D CAD), where there isn't even any software to install – it's all running on remote workstations. Within the industry, Autodesk doesn't seem to be looked up to in terms of their business strategy. Their CEO in particular draws some pretty unflattering flak. Makes amusing reading if you can be bothered to take a look.
Unless you reckon on forking out professional-level payments annually for "support", the process of selling on your hardware and software is just like anything else – you trade it for a cash payment. Unless you've recently bought (sorry, rented) a more recent type of application.
Murray