Don't take this the wrong way, but why? This is a used, old keyboard with a common switch type. Are doubleshots, "true-ANSI", and ALPS branding worth $100?
Naturally, by the most common definition, anything is "worth" what somebody will pay for it, today.
I cannot imagine paying $20 for a skull-shaped key cap, much less 10 times that amount, but others will.
Old, used? I am typing this message on a keyboard manufactured during Ronald Reagan's first term in office.
Personally, having owned at least 3 dozen keyboards with Alps switches, I found this to be one of the best.
My original intent was to sell it for $85 including domestic shipping. I made the mistake of "getting greedy" and assuming that it would probably sell higher.
I should have put it up on ebay. Being a worldwide marketplace, that is where a seller < might > get top dollar, or a buyer < might > get a bargain, depending on a combination of skill, luck, and timing.
Here at geekhack, many members expect to find bargains, and/or sellers who don't need the money, and, from my perspective, things here tend to trade consistently near the bottom of their "normal" price range.