Buckeye,
I believe the reason that you see Hoyt so prevalently in the Olympic circuit is from a couple of things. Hoyt was one of the first companies to design recurves of that particular style and most other target bows are adapted from Hoyts designs. Hoyt has always been good at getting their bows into the hands of top shooters as well, through sponsorships and the like. Overseas target archery is much bigger than here in the US and Hoyt pushes hard in that area. In fact, I've often heard it is easier and faster to get a Hoyt Oly style bow in Europe than here.
In regards to the Gamemaster I've owned several of them. I've shot them setup stock, with various ILF limbs, off the shelf, and decked out. It is extremely versatile and a very accurate shooting bow.