Why are gg domains so expensive?

Could you please elaborate on why gg domains are so pricey? I've noticed that compared to other domain extensions, they seem to fetch a much higher price tag. Is there a specific reason behind this, such as their scarcity, popularity, or use in particular industries? Additionally, are there any other factors that contribute to their high valuation, and what can investors expect in terms of potential returns or risks associated with investing in gg domains?