My observations here in China, would be that mass produced (in a new colour every season), and what I would call "Factory custom" are heavily outweighing true handmade, custom built cues.
Point of order:: it is not a custom cue if the cue starts to get built before the owner specifies the parameters.
If you, the owner-to-be cannot specify the colors, rings, inlays, veneers, wrap; it is NOT custom
For example, the Remington custom shop does not start your gun build before you specify what is it to be.
So, 'factory custom' is just a 'factory' cue and nothing more.