There are many reasons why you would buy a used graphics card. First and foremost, the savings, of course. With the mining madness now over, we've been given the opportunity of buying graphics cards on the cheap. Also this past generation of GPUs also received a much longer than expected life cycle, meaning you are not getting overly old GPUs, but fairly serviceable gaming hardware.
There is a lot of free Microsoft software to be had, programs which enable better web surfing and help protect against spyware are just two types. PCSTATS Tips