I don't believe that body would bring $300. For a refin '75? Not likely. (if the body has been routed, it absolutely won't bring $300). After that, what are "the rest of the parts"? Bridge and pickup are gone. The neck is junk. The only things left are the tuners, which are worth around $150. The signature, as mentioned above, isn't worth anything unless it's documented.
You might be right - but I see bodies of a similar Fender vintage in this condition going on Ebay for 300-ish all the time.
Sorry dude, the mods have ruined the re-sale value on it, all mods ruin the re-sale, especially poor mods. That de-fret looks terrible, keep the bass for sentimental value, you would never get $1000 out of it, if you did it would take a long time for you to find a buyer. You probably wouldn't get an offer higher than $300 from anybody, unless it was trade-in value.
Also the Gene Simmons signature probably takes more away from it than it gains, most bass players don't care for Gene Simmons. I was interested until I saw it. (Shannon's family is local, lots of Gene spottings here, only people who have nice things to say about him met him in a professional setting where he was getting paid to talk to them, Gene is a $ addict so he gets friendly)
Even in a Kiss auction, Gene's signature isn't a high money rarity, unless it is on a Kiss pinball machine or something actually Kiss related.
You might be right - but I see musician-autographed guitars where the guitar is a disposable 179 dollar instrument (i.e. not a vintage Fender (modded or not)), where the musician who has signed is less desirable than Gene Simmons, going for more at auction than the amount I recommended the original poster sell the bass for in my recommendation "sell the whole bass for cash". The amount in my "sell the whole bass for cash not at auction" recommendation is not "high money" (your term), so "high money" was never part of my discussion about auction sales.....only "higher than selling the whole bass for cash not at auction" And, you mention that bass players wouldn't be interested in it because they don't like Gene Simmons you say....but I certainly did not recommend limiting the auction sale to just bass players.

