I cannot offer security in the sense of not having payments retracted if you're using PayPal, but I can urge users to look into other options such as Bitcoin to help mitigate against this. Creating custom code/NPCs/scripts is something I think would be beneficial to some users, but it may thwart development, so I will really need to think about this. Realistically, it'll be down to the person. I think this is better than someone trying to sell add-ons, given that it is a person requesting the assistance of a coder.
Your main point, though, is having someone set up a server for you for a fee with the files available on the forum, yes? I know people are doing this already via PM/Discord; I've seen this happen, and I know some members are actually doing this legitimately. So, the counter to control the scammers could potentially permit this to happen via the system, but once again, it'll be down to the feedback from the members.
I am open to all suggestions minus the sale of server files because this then puts a market for hacking/selling and using us as a middle-man. I cannot be responsible for the distribution of potentially tens of thousands of dollars worth of hacked or leaked content. Publicly shared, sure, sold - never.