The result is the same if you don't give a shit about the quality of the keycaps you are using. Most people don't care at all and that's fine. For those of us who do care even a little, the result is obviously not the same. Even if you don't want to pay for the more expensive option the difference in quality would be apparent.

Also, custom keyboards are basically fashion accessories (and I'm typing this on a $1200 fashion accessory so that's not a criticism of people who like fancy keyboards). After you get above a few hundred dollars the diminishing returns hit hard and fast and at that points 99% of what you are getting is aesthetics unless you're talking about some kind of rare vintage board. Luxury items are frequently priced different from practical items. Lots of people will pay 10-100x the price of an item because it was "made by hand" just because they want to enjoy the expertise of the person who made it rather than just have an object that was produced by a machine.