You missed point here. Try to read OP more carefully.
To the OP. I find some HYIP script resellers, so you can buy $50-$200 per script. Price depends of how much options you want to get, like automating transaction, number of website templates etc... Probably when you buy this script once, you can install it to lot of new websites.
Domain annually cost $1-$15 depend of extension. Web hosting $1 and up monthly (there is no need for super expensive hosting and lot of compute resources)
I guess, next expenses is to promotion.
But yes, It is a proven way of scam and it's always risk to be arrested because of this business way. So, stay away from there as user or as owner, no matter.