Because loyal customers shouldn’t be treated like poopies? 
Also when you make a long run investment (learn to use it, perhaps buy a couple or more licences for your studio, etc) it isn’t exactly comperable to buyng the new X Y harware…
However you are right in one thing. If anyone wants the .5 paid updates gone, or lower prices in general, they have to speak with their wallets and not act like fanboys eternaly.