I dont see the need of xenons. Its like having stadium floodlights in your home. he he he 
That's fine...and you save £1000.
But if someone else does see the benefit, and wants to drop £1000 into them...what's the problem?
Their value/worth is decided by the buyer...I've spent more on them in the past, I've spent less on them in the past...on each occassion I've been impressed with how good they are...and will continue to spec them in the future.
But I wouldn't expect everyone to....each to their own.