$190 - $90 "Average used resell of the 2600"I personally wouldn't consider 10-15% higher FPS worth $200. I'd set that money aside for a Ryzen 4600 which should perform even better thanks to all cores in a CCD residing on a single CCX with direct access to the entire L3 cache pool on top of all core-wise and likely IOD improvements.
Don't forget the hassle and costs of reselling stuff too, especially on platforms like eBay where people often have a light trigger for charge-backs and then you have to deal with getting your item back if you want to attempt re-selling again.