Well, all self-aggrandizing aside, I doubt that your doubting would be borne out by WGT stats. Again, my observation is that most 100CR brackets (tierless or tiered) fill up in the course of a single day, much of the time sooner than that. Then along comes a 100CR bracket that has the usual suspect courses (aulde standards) -- but -- one of those courses happens to be Merion.
I won't play them because I detest Merion, but I did observe that one of the recent 100CR brackets that included Merion in the lineup took over 3 days to fill. I also noted that was the case with other brackets that came along that included Merion. Bracket tourneys that did not include Merion were filling up same day. Argue that point if you wish and spare us the strut that only good players with game adore Merion. Your argument is against WGT stats.
You can claim what you wish about Merion, that it's a "tough course" when others will claim that it's not so much the properties of the course itself but that it's poorly programmed. That's to say club distances are way off from certain points on the course, several green breaks don't behave "honestly" = as per the same breaks, at same Stimp, on all the other courses, etc. (and no, Merion doesn't have it's own scale of gravity).
If you're a WGT shill, I should think you'd be jumping all over this to agree that including Merion on bracket tournaments is a loser idea for WGT ($) due to the slooooww turn-over; and recognize how unpopular Merion is in bracket tournaments by virtue of how long it takes for brackets to fill out if Merion is one of the courses. My main beef is that I just dislike having to wait for another bracket to come along that doesn't include Merion.