OP:
Your post led me to check how many different blends I currently have cellared. So far, I'm up to 97, spread across 806 tins. (Most are 2oz/50g tins, but I also have a number of 100g tins and maybe 6 1lb tins.) I don't believe in bulks, so everything I have is in the original factory tins. I would say that fewer than a dozen of these are single-tin-only tobaccos, which are, for the most part, either discontinued blends that are now hard (or expensive) to find or tins I've received in trade that I haven't gotten around to trying yet.
I've been smoking a pipe long enough -- 30+ years -- to know what I like and how much variety I enjoy, so I've focused on those areas: English, Balkans, straight Virginias, matured-VA flakes, some Scottish blends, a few VA/burley flakes, and one or two aromatics, depending on how you define them. It's hard to draw a line and say "I'm stopping here," when there are so many good blends available these days. . . and no guarantees whatsoever that the blends you love today will still be available in the years to come. I'm not stockpiling against inflation; I'm stockpiling against companies going out of business, leaf becoming rare, etc. I've seen too many wonderful blends (and blenders) simply disappear from the marketplace.
BTW, I only keep about 5-6 blends open at any one time, one in each of my major categories. Penzance is always on that list; it's my go-to favorite. But right now, I'm also working on jars of McCranie's Red Flake, Pease's Raven's Wing, Samuel Gawith's Perfection, McClelland's Drama Reserve and Frog Morton on the Town, and one aromatic, Sutliff's Great Outdoors. Each fits a different mood and a different rack of pipes. It keeps things interesting.
Bob