I agree with the first statement, and should add I'm American and my top 3 are Intamin, B&M and GCI (though as I ride more RMCs they are likely to get in there) so there ya go
I am not familiar enough with Europeans and their preferences, and being in the enthusiast community many love those companies as well. However I'd not be surprised if many had Mack in the top 3.
In your opinion has this seemed to be the case? If so, I think it's pretty simple: Here in the states we really dont have many Macks, and certainly they are not as prominent as the big 3, while in Europe it's much more so. I think that's all it really is.