good thing you are not getting ripped off.a fish is worth as much as you feel it is.If you wanna spend a 1000 on a guppie go ahead just make shure you really like it.ask to see it eat yada yada
I wouldn't spend that much on fish, but to each their own. If it's a fish you really like, rare where you are, and you feel it's worth the money...then go for it.