Yesterday i was at a place where the owner does care a lot about both, so he build his Purifi based amp in an diy amplifier case of beautifull polished aluminium, bronze and wood. It looks like a fancy 1970's receiver, but the preamp is a diy super clean opamp based system, there is a minidsp board hiddin in the case (accessible trough lan) and the power amps are purifi boards. He also added VU meters (technically useless in an amp) and an OLED display (that tells the source and the minidsp preset).
It costed him about 5x the price to make this "audio jewel" and develop the VU and display system (he's an electronic engineer) than when he would have bought the boards and put them in a cheap generic case with standard switches and dials (that would sound the same) but for him it's worth it. So yes, asthetics do matter for many... But not enough to me to justify the 20K price it would cost to make it for myself. (4ch amp with preamp and dsp). But at least it's not spend on snake oil, it's on asthetics.
It's the same guy who buy's a JBL M2 set (which is amped with this amp) and rebuild the cabinets in plywood with a full wood front because he don't like the asthetics of the original. He did even cnc the horn from a big block of chesnut wood that dried for decades. I did not ask how much this costed him, but it must be a fortune (he hired carpenters for this). The M2 won't sound better, but fit his (and mine) asthetics a lot more and for him (not for me) this is worth the price it costs.