Just need to use some common sense. The average person isn't going to have 10mil to drop for a carry. Your Coil lockout is valuable, but you also have to be realistic with your prices. You probably also need to get some info on your potential customer, such as messaging people within their FC to see if, to the best of their knowledge, that they legitimately made their money instead of sourcing RMT.

I don't think you'll ever 100% be able to know whether a person's money is legit or not, so there will always be some risk involved. You just have to do your due diligence and take the necessary precautions to figure out whether the buyer has a legit source of money.

As others have said as well, I don't think GMs/CMs are going to give you some kind of assurance that what you're doing is ok and that you won't be liable if you receive some money that wasn't obtained legitimately.