Among buyers of top tier 1911s, a lot of things often enter into the buyer's development of manufacturer preferences.
Of course, there are the guns themselves. That's a given.
But as just one of many
other examples, right here in this sub-forum, there is the long-standing role here of WCR. +1911 a thousand times over. Really obvious examples include Bill Wilson and his entire family. Warm welcomes extended to visitors. Bill's books and videos. Commitments, philosophies and fulfillments of those commitments and philosophies. Continuity factors, past, present, and perceived future. On and on it goes.
Even seemingly "very little things" add up over time. Maybe not so much with a first time buyer -- who might be mostly comparing two pieces of steel -- but probably a definite factor with repeat customers. Especially when top tier 1911s, all built to exactingly standards, are concerned.
And I'd bet/guess that repeat buyers represent most of Wilson's customers. Top tier 1911s aren't cheap, even for those with fortunate financial circumstances. Most buyers probably aren't inclined to try something else just as a sampling or on a whim, once they have found one or two (for variety) builders who've provided consistent happiness. At least some in this sub-forum have chosen to focus on Wilson Combat and Ed Brown...and it's probably not an accident.
NHC is, if course, first rate as well. I'm focusing my above commentary on Wilson because of familiarity with the latter....and this is, after all, the Wilson sub-forum.

. The same OP question, posed in the NHC sub-forum, would likely get more NHC-focused responses.