Vintage is great. Inexpensive. Bombproof (enough components are anyway) and the ideal introduction to cycling!
I love them also because I'm cheap and I can afford yesteryears high end without killing my wallet. Also the ability to retrofit or keep original is amazing. I have built modern, restoration, fixed gear conversions, IGH, and gravel grinders with vintage steel framesets. And even if the girlfriend doesn't agree, it's a great hobby. Overhauling a set of loose ball hubs is a form of meditation to me.
Anyway love the forum and insight. Great topic.