There's still no reason for them not to sell older versions for super cheap. CS6 should be like $50 at this point. It's not like they have to offer support or anything.
As a pirate of their software going back to PS3, that's about the only way they'd get me to pay.
The same goes for windows. I only recently bought my first legit copy(sans pre-install on laptops and the only non-self-built, a Compaq back in 98) of 7 to upgrade to 10, because I bought the key off G2A for under $30.
If you want to compare digital IP to physical goods, then the prices should depreciate like a motherfucker.