Personally? Got into vintage bikes in 1994 with a Colnago Mexico. Bought my grail Bianchi Super Leggera in 2019, then called it quits on the buying. Sold a couple in early 2021, which truly illustrated (to myself, anyway) I was content with what I had. As of today, I still have no desire to add to the collection, but still ride them as often - and as hard - as I can. Riding? Can't see myself ever quitting that. Collecting? Yes. After 24+ years, it's finished for me.
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Just one person's story; yours will likely be different
DD