I think your reaction is a bit much as… why even get mad? He’s not the only one with that reaction, as I feel similarly. No reason to try to insult some one just because you get your feelings hurt because you feel your previous investments of time and money are worth more because of sentiment.
10 molds that look fairly worn, 50yds of carbon, and a vacuum pump worth $100. I don’t see where that adds up to $7k, $2k maybe? I think if you had a more detailed list of what you’re selling, which is really a business not some random molds and materials. A business may be worth 7 grand, but as with any business you must expect the purchaser to want more detailed info.
I do think that you’ve probably made some good money with your setup. Corvette parts are not cheap though I did see a ton of competition on ebay. This might be a good setup for some student, etc, as you said but, who has $7k sitting around when their 20?