I'm one of those weirdos who has TAD but not PAD. In fact, I would go as far as to say that the thought of having more than a dozen pipes legitimately gives me anxiety. And even that is a very generous number--I'd probably be fine with half that, each dedicated to a different blend group, and involuntarily feel the need to cull the herd if I got into double digits. About half of the dozen I currently possess were given to me as gifts, and I'd be hard pressed to get rid of them. Which is probably a significant factor in keeping PAD at bay.
Tobacco? That's an entirely different story. Perhaps it's because I bought a ready-made cellar from someone back in the early days, and since then I've just been adding and subtracting blends on the fly (mostly the former), as I began to suss out what things I loved, what things I abhorred, and everything in between. More is better when it comes to blends; I just love the variety too much to be confined to even a handful of blends. In jars alone, I currently have about 30, with a fair mix of Virginias, VaPers, VaBurs, aromatics, and Englishes. Basically everything but Lakelands and burley-heavy blends. Another element here is that I'm hedging--tobacco will never be cheaper or more readily available than it is at this precise moment, and we all know this to be true. So in a few years' time, I've built a respectable cellar in the neighborhood of two dozen pounds, and I'm basically set for life, even if I tripled my current usage.
One final thought: I can't help but think that many of the constituents of pipe smoking lore who smoked only one or two blends would have expanded their menu if they were around in the present time. I can't imagine C.S. Lewis
not filling his SP cart with some Mac Baren bulk on sale for 15% off just to hit that free shipping threshold. And maybe snagging a couple tins of Davidoff Flake Medallions because holy shit it's back in stock again, better hit it quick! And some pipe cleaners. And that bitchin SMS estate meer with the carved C.S. Lewis face. You know, just to be ironic. And a pouch of Captain Black Platinum, just because hey, it's just VAs and burleys with no cavendish, might be interesting. Whoops, C.S. Lewis just overdrew his bank account. Better cash out that Bitcoin while you can!