That Mysterio card is an absolute dream. I am truly jealous.
DOTB is going to do way better than I am on this but I wanted to play the prospecting game too.
To DOTB's point, the Reigns sold for a bit over 8k - on one hand he is the S-tier star of WWE right now (and it's a great looking Reigns card), however it is also not signed (he has a signed superfractor auto in the set as an insert, that market would be intereting). This may be an oddly high outlier - the 2020 Reigns superfractor from Finest sold for "only" 2.3k as a buy it now, but the person may have underpriced that. I think Reigns is probably the Trout of this hobby at this point.
More in the Mysterio realm, the most relevant comp I saw on Ebay's saved listing was 2020 Finest Shinsuke Nakamura: a massive star in the international market, autographed, Topps Finest, non-rookie and male, which sold BIN for $625. In comparison, the /10 sold for $40 on a best offer. If you apply the same multiplier (about 16x as we have a /10 for Mysterio that sold for $115) to Mysterio, you get to about $1800. This feels aggressive to me personally (I think the Nakamura /10 went for a bit under what my gut says it should and someone may have ponied up for the 1/1), but the thing with Superfractors is that they are really hard to price out given you need the right buyer...but there's also no competing market. If they want the 1/1, they HAVE to go through you. This would be the crown jewel (sorry) of a Rey Mysterio superfan's collection, they exist. As a wrestler, he's also one of the small handful who has a highish floor. Like, the WWE can probably on a whim decide a wrestler is irrelevant, but Mysterio has so much history and fan nostalgia built up that he's probably less risky than most other wrestlers. As for why I feel $1800 may be high, my reason is Asuka. The second higher superfractor from the set sold on Ebay right now is a signed Asuka (similar to Nakamura and Mysterio - international superstar with a major following) which went on best offer for $775. Mysterio and Asuka had very similar markets for their Transcendent /5 (mid-300s for both), so I think the high end comps were in the same realm. With that said, Asuka is kind of all over the place pricing wise on autos, so this may be a small sample size deal, and Asuka is out on injury and Mysterio is an active performer.
My gut feeling is your pricing is about right. It's a tough call since it seems it's like other cards where it runs hot on release and then cools off sales wise, so there is a risk to listing it high and hoping it sells before the fervor dies down, but Wrestlemania weekend with a new set? If you're gonna sell it's probably a good time.
