I really don't see what all the fuss is about. These aren't fragile things? Leaving them on a desk is good enough and if your paranoid put them in a plastic bag or a drawer?
It seems to me like buying a dedicated stand for £20+ is just throwing money away. Unless of course your headphones are over £5000 and fashioned from unicorn foreskin!
Your sofas are made from velour and suchlike and you put your feet up on these?
I have worked for Sony PlayStation for over 10 years and see all types of headphones (some very expensive) hung from chairs, on the floor and stuck in drawers with no ill effect whatsoever. And yes they are expensive and are paid for by the employees themselves.
Its one thing looking after something its another wasting money on something you don't really need.
The only use I can see for headphone hangers is in a studio environment where there are many sets and the need to keep them untangled.