Do you mean case or bottle purchases? I’m going to assume cases…
I used to buy 2cs of GPL every year. That stopped a few years back so now my regular purchases are probably Hudelot-Baillet Chambolle Cras and Bonnes Mares. Nothing much else I really follow each year by the case any more.
I’ve never bought a case of any one wine in my life. But the producers that I buy from every vintage are (with the wine I am most likely to buy):
Williams Selyem - Morning Dew Ranch and Westside Road Neighbors
Rochioli - 3 Corners Pinot
Turley - Pesenti and Ueberroth
Ceritas - Porter Bass Chard
Liquid Farm - Golden Slope
Mollydooker - Blue Eyed Boy (guilty pleasure I’ve been buying since the first vintage)
None, and I think not being married to buying something every vintage is a strength. I will skip a wine or a whole vintage from a region. I have some “verticals” with holes and I’m fine with it. The closest I come is with Mugneret-Gibourg.