Everything is worth something to someone, but given this PSU is 10+ years old (released in 2010 by my research) and only 80+ gold certified, and it's not digital, then probably not worth very much. Depends how patient you are and how bad you want rid of it. If you just want it gone, stick it on ebay for $50 and it will probably sell quickly. It may or may not sell at $75 but might take longer. Probably won't sell at $100 but I've been wrong before. Original selling price according to corsair website was £290.
For comparison I bought my PSU used and manufacturer refurbished last year. At the time it was 3 years old, Corsair AX850 from 2018, not digital but 80+ titanium certified, original selling price brand new was £210, I paid £110.