Wait what ? You want to CREATE nulled adult dating scripts, like in null them yourself ? I don't think you will profit much from it, at least not more than if you just create a warez blog and fill it with others' releases. You won't profit much in both cases.
I think he wants to use a nulled dating script. Yes, you can use it but not without risk. I say use it to try and if you're happy, buy it and make money
