Okay. I see your point.
Forgive me if I'm wrong since I don't know what MSF is. I'm from Aus, so I'll asume that means new riders. But as for a test of beginner bikes by novice riders, that would be a crack up reading about all the new ways they found to wedge themselves in bushes and car bumpers.
(made me laugh just thinking about it)
As for Goldwing riders doing Goldwing tests. You make a good point. While I'm sure the MO staff do plenty of touring, I'm sure there are many little things that a dedicated tourer would be able to point out that MO might miss. But I think the MO staff are still capable of covering 95% of the issues that would come up with testing bikes in different categories.
I think an issue here (especially if the stories we hear of litigation crazy America are true) are that I'm sure there is more to testing bikes than just getting any old biker, poking a bike at him, and telling him to go off and do a review. I must admit that I'm fairly ignorant here, but I could imagine that their would be many legal and financial issues (eg insurance) that would stop MO giving their bikes to just anyone to test. You've also got to find someone who can actually spin a good yarn as well as ride the things. Then I guess you'd have to think about what MO would have to pay these freelance reviewers.
I guess there are 1000 different reasons why it wouldn't be worth MO's while to have these guest testers, just as there are many good reasons to have them.
Maybe when MO goes subscription, they will be a better position to offer some reviewing variety.