You always have to consider what other options are in play when using alt extensions.
You have .game .games .xxx etc... adult domains usually do not sell for high amounts unless they have targeted traffic:
An extension such as .org is used in charitable, or more social settings, using it for xxx games doesn't make much sense, and erodes any value the keywords bring.
Someone has to like this domain much better for you to create an aftermarket for it, and pay for it. Don't see it happening with all the other options in play.