Thanks for letting me know, it should be fixed now!
Using the GodPoints for this one too would mean limiting the number of GP you can use elsewhere, as GP will also be used for physical modifications for your character in an upcoming patch as well as some other things. We figured that since it's easier to earn coins than GP, it would be easier to expand the dungeon using it instead! The Pleasure / Play points are just a way to separate this from GP (we could just not have named it as such at all and then just required coins to expand) and will be used only for the dungeons and nothing else outside of it!