how do you value a plate? im selling FI5 COS which can easily look like RS COS but dont know how much to put it up for as im not allowed to put offers in the for sale section so that rules any offers out,ebay is crap for plates and if i use a dealer they will prob value it at some ridiculous figure just so that i let them sell it for me and ill prob still end up with it after several yrs so whats it worth folks?