Interesting to read profuse congratulatory, ‘way to go’ and ‘good fortune’ remarks. Yet this may have come at the $2,800 expense of seller’s misfortune/ignorance of not knowing the fair market value of their lens. Or perhaps the seller knew but wasn’t interested in obtaining FMV.
Whether a potential buyer might feel an obligation to notify a seller of FMV may be a personal dilemma, be it philosophical or moral. Or no dilemma at all. Food for thought…nothing more.