Linear Phase
Being able to sell a product after you have used it is a, "basic civil liberty," what?
By that style of logic, if you have an infectious disease, it is your right to sell Kleenex after you have used them to wipe your nose.
Well that's definitely not a liberty of any sorts.
Your logic is badly flawed. Cakewalk's restrictions are exactly the same as the sales contract for a new car stating that it cannot ever be sold to a new owner. Outgrow your car or just want something nicer and your only option is to send it to the junkyard.
Cakewalk is the only company that I purchase software from that has this policy. Their products are valuable enough to me that I will tolerate this nonsense; apparently enough people agree for them to run a business.
It is my understanding that in the EU, such provisions in software licenses are null and void. Both of the posters you linked to claimed EU residency, so your concern is misplaced.
It is a mistake to conflate reselling software with piracy. It is quite clear from the referenced threads that the individuals were selling licenses to software that they no longer used. It is nothing like the fiends that sell $50 copies of Sonar on eBay.
And, finally, while the health department (or more likely, the absence of buyers) might have something to say about you reselling your used Kleenex, it is certainly isn't any business of the Kimberly-Clark company.