usually BM pre-pros and prototypes are worth at most only a small premium over the std models, and then only to a collector.
that said all AFCKs are going up in value since they were disco'd, they are still pretty popular, FWIW i have a LNIB AFCK11 prototype, i doubt many of them were made, some of the BM protos differ quite a bit from the production run (ie the 710) but this ones about like the std 804's. i would say its value is about $125 to $150 , std 804's about $100, i dont think a prepro would be as much as a proto though, pre pro a little over $100, say maybe $125 tops if LNIB and i dont think it would sell fast, would take a while, on BF anyway, maybe ebay would be better though..
so yes i would say leave it alone, get a std model for edc, just dont expect to sell it enough to retire on lol.