I don't see it.
Maybe it's the lack of other use.
Maybe it's the fact that Z/C have a 2 month FULL FUNCTION trial, so you can SEE it in action, as if you had paid for it.
Maybe it's the fact that even with a harder scripting method, it has a cleaner look.
I think it's the first reason here. Z is a Multigame Telenet program First. A DR assistant second.
Genie is like SF. Locked to simu games, with no use for any other game, which is a shame, since I could see the scripting being used for !spellups being quite nice.