"My question is why? "

I like 'em.

"Isn't one properly and effiiciently working bike enough to sate your hunger?"

No, I set 'em up different like for different purposes.

"Don't you feel that in owning so many bicycles that you become more of a collector and less an enthusiast."

Yes, I am a collector... and enthusiast. They're far from mutually exclusive. I use what I collect, though I'm cautious with some of my stuff. The 1967 PX10 does not get ridden in the rain, for example. I've hacked a 76 Gitane TDF for that.

"Is there a point when you own so many bicycles you become less fond of them and more fond of their sparkle?"

No.

"Can you ever own too many bicycles?"

depends on how much space one has available.

"Why do you own so many bicycles?"

Like 'em. Keep finding abused classics cheap and fixing them up. Inane hobby maybe, I dunno, Iduncare.

"What would you give up your bicycle for?"

Which one?