Some people get as much, if not more, enjoyment from making toys as they do using them. And/or it's as much about learning new skills as anything
While it's cheaper & faster way to buy a mass produced 'whatever' often it won't be exactly what you want... an off the peg suit ain't gonna fit as well as a tailor made one. Same deal with a bike frame and while the fit can sorted out by playing with stems etc that has a knock on effect to handling and weight distribution etc which can bother some people more than others. If the frame is custom made then things like stem length can be used to compliment handling instead of compromising it
While it's cheaper & faster way to buy a mass produced 'whatever' often it won't be exactly what you want... an off the peg suit ain't gonna fit as well as a tailor made one. Same deal with a bike frame and while the fit can sorted out by playing with stems etc that has a knock on effect to handling and weight distribution etc which can bother some people more than others. If the frame is custom made then things like stem length can be used to compliment handling instead of compromising it