All Hyip are not scam otherwise we are web developer and designer so it'd our profession and Hyip are not scam. The owner of Hyip admin doing scam. So people are do scam with Hyip program.
Did you understand?
The problem is that you don't have any resale right for these scripts you try to sell it.
I don't thing someone will buy any script for you and risk to lose his money (the scripts can have hidden backdoors)