"beauty is in the eye of the beholder" is the first thing that comes to my mind.
Everyone like eye candy,but having owned several tube amps,they basically all have the form follows function type of look.
They are all simple metal case works with tubes and transformers sticking out of them.Some case work has been wood, like my DecWare.
But, are you willing to trade off good sound for a work of industrial art?
You are most likely getting less sound for the dollar and paying for cosmetics.
I would gladly pay more for superior sound .
If I want something nice to look at, I'll buy a painting or sculpture.
Besides, I listen mostly with the lights out.
The beauty of glowing bottles filling the air with music in a darkened room is all the beauty I need.