Also, anyone using Adobe software in a professional setting (meaning actually getting paid for using the software) can easily pay the monthly fees. Even if I were getting paid for my photography, why would I want to pay extra fees?
Staying on an antiquated version of software means they can no longer open files that are created on recent versions of software (thinking Premiere).
In the case of Lightroom the only thing that's going to "upgrade" your file format is a new camera body, and that's not something I do all that much. I don't need to open files from people with newer cameras. And, let's face it, if I really need to open newer raw files I can use Adobe's DNG converter.
Lightroom 6 is a 64-bit app with a 32-bit installer. Newer versions of LR offer up a ton of cloud shit I don't want, bundled with more seamless integration for newer cameras I don't own. What am I getting out of monthly payments to Adobe?
The past few upgrades to Lightroom that I've bought were around $80. Well less than a year of the cheapest CC subscription.