I was running Lightroom 5 happily until I consolidated camera bodies and upgraded to the 5D4 when I needed to update to Lightroom 6 just to have support for my files.
As someone who is not making money from my hobby I can't justify the monthly or yearly expense for something I can get out of the software I paid for once and was done.
Also important to note given that I had to replace my laptop recently, Adobe is actively trying to make it difficult to access the standalone versions of their software. Getting the version of software I have a license for took several hours with Adobe tech support remoted into my computer to make happen.
If they continue the pay as you go I'll be finding a new solution the next time I need to update.