[flogic]

Manufactured or pre-made split keyboards aren't cheap. However if you're making your own the costs aren't all that different. So it's easier to ignore the cost and effort if you're making a split keyboard. Also by definition, you're talking about someone willing to go down the less beaten paths.

I would love for split keyboard to become more mainstream. They're far superior to the traditional key layout. But if the sample set is customs, it's probably selection bias.