how much interest is there in unusual games?

[zlefin]

that is, ones that use substantially abnormal settings, or ones which significantly alter correct play.
i've got some ideas, but i'm not sure if people are interested; or how saturated the game supply is.
in particular, i'm thinking of things which approximately use the normal base game, but wiht peculiar mods or other changes.

also, how hard is it to host a game? never done it before, so gathering data on that too as long as i'm asking.