As a runner and measurer and 35 plus year USATF member, but not a certifier I do not think requiring measurers to be USATF members is a good idea. If the one of the features of the certification program is that anyone can measure for certification, requiring USATF membership is one more a hurdle beginner would have to overcome. If the measurer is not a runner, there is no advantage, that I can think of for USATF membership. I realize measurer membership was not the question.
Certifiers are another story. Certifiers actually represent USATF. They get their position (authority) from USATF, they should be members.
As for tangible benefits for certifiers, I don't see that there are many. The listing of courses on a website benefits the course certification program, and therefore USATF far more than it benefits a certifier.
By the way does anyone think I have received benefits comensurate with the 35
plus years of USATF dues I've paid, especially if I've never participated in a track meet or won anything for running? No bitterness, I think USATF is a good organization. I'm really looking for some tangible evidence for USATF membership benefit that I can use to convince others.