TBH - and I know you don't but like this is a huge flaw with art culture in general? - even if you DID want 100 for a design, you'd DESERVE it. Your hard work goes into your designs, why the hell shouldn't you charge what you want? You have really incredible designs and they're well worth the money. People undervalue artists SO DAMN OFTEN and while I know you're not comfortable taking more - and I don't mean this to push you into taking more - the fact that people assumed that's what you wanted and then gave you shit about it is ridiculous. That would be a bargain and what people run away with at auctions is a bargain holy shit. Support the artist, people, stop undervaluing them so you can get what you want.