I’ll take a swing at this. I happen to like the less ripe vintages so am glad I bought, and wish I had bought more of, vintages like 1999, 2001 and 2004 (even 2008 had some really nice, inexpensive finds). But there are some vintages, say 1997, 2002, 2007 and 2011, that I just largely pass on. For me, there is no sense in buying Bordeaux in a weak vintage (BTW, 2002 Northern Medocs had a few stars) when there is so much Bordeaux available in the marketplace. I have to qualify that I do not pursue verticals of anything, preferring instead to buy selectively. A rare thing for me to do is what I have done with distinctive wines like Levet, where I bought every vintage from '04-'11. Levet Cote Rotie just happens to be a very unique wine and the winemaker allows the vintage to make the wine, thus really offering something distinctively different in every vintage.
BTW, while I declared a moratorium on buying Classified Growths after the 2010 vintage (I’m 48, so don’t wanna wait until 68 to appreciate), I did selectively buy some 2012s. It was tough to pass on quality Classified Growths that were being priced at $40-$50.