As a professional software developer with decades of experience covering almost every keyboard type known to man, I can honestly say the characteristics of the various keyboard types aren't enough to matter, other than as a comfort or RSI or vanity thing. I've never found a $100 vs a $20 keyboard to affect my performance. I HAVE, however, found the difference between a $500 and $3000 guitar to be quite noticeable. It's hard to go back to a cheap guitar from a good one. It's not at all hard to go from a $300 keyboard to a $30 one.

I used the footstool analogy because I could just as easily see people obsessing over it like with keyboards, fountain pens, and audio equipment (getting high precision angle and height control, presets for different musical styles, different grip surfaces and build material, etc).