"What is the reason and source for this drive by so many shooters to build or buy a gun that pleases someone else?'
I have not seen this at all, many want a gun that is very close to what the originals were, many want a nice gun with good parts and don't care if it is close to how the originals were made, many choose an out of the box production gun, I think the important point is to offer sound, valid, advice and info when any of the above buyers asks questions so they can make an educated choice if they do not have a lot of resource material or experience under their belts. This does at times seem to ruffle the anti PC feathers but such is life.