Used for trad climbing, have absolutely loads of life left in them, no falls as I was a trad chicken! There is also no abrasion marks or any other damage to them. They have been lovingly stored (as all my gear is) sealed away in a bag. I would never sell anything that I wasn't 100% comfortable with or confident in.
I have finally started to sell my beloved climbing gear as I am unable to fully recover from tendonitis.
There was a time of thought I could not recover from (elbow) tendonitis. I finally had a medial epicondylectomy (for golfers elbow) and fully recovered. I would say don't give up but explore your options. Good luck on the sale.