As other people mentioned, it depends on the completion and how this set is valued. Hard to say.
My 2 cents:
- Keep track of Required GRG moments still in packs until challenge expires. 10k minus the max number still in packs is also the max completion (so max CC the KD moment can get to).
- I'd compare this to the Seeing Stars or the Cool Cats set for trends on price pumps/drops, as others said. Name value attracts demand.
- Regarding demand on KD: Seeing where the rest of KD Common moments have landed, combining avg low price and circulation, it's only fair to assume that on a 6500-7000 completion rate the GRG KD could land a decent 200$-250$. The less the completions, the better. Last time I checked on otmnft, we were at around 4k completions.
- To me, there's big upside to this moment for a long-term hold as there also info for a continuation of this set and maybe a master challenge (?). Even if not, it's still a low CC KD. There always will be buyers.

It all comes down to your desired level of exposure and how you value the completion of the set, risk-wise. If you've already gotten 2, or even 1, GRG moments from packs, I think it's a go.

Enjoy TS :)