Two confessions:
1) I DO have an extensive cellar.... of nasal snuff. Mainly accrued by accident, rather than intending to future proof myself. It was only when I realised that I probably have enough snuff for about 5 or 6 years that I started thinking things were getting beyond what I intended. Then when the EU TPD news started breaking and blends were vanishing, I snaffled up a load more, and now have enough to last me about a decade. Despite having a 5 year stash, I had an anxiety of sorts that I'd never be able to buy some of my favourites again, and spent more than I should in getting certain blends jarred up in bulk, accompanied by a wide array of individual tins - stocking up on my favourites was more important than any perceived time frame. I still make the occasional purchase, but at less than my current consumption rate.
2) I have been guilty of clearing an online vendor of a couple of blends. I spotted a vendor that had some stock of a nasal snuff that was known to be discontinued, and had also been reduced in price to about 1/3 of the original price. I waited for a month (to let others get their fill), and the stock was still there, so I picked up the phone and acquired all 24 tins.
Pipe tobacco is WAY more expensive over here, which makes it a lot easier to not fall down the same rabbit hole. I also depend less on pipe than I do on snuff for my "fix" of tobacco pleasure. It's something that I want to continue on a low consumption basis, but not something I feel compelled to future proof myself with. If all that remains of blends in 5 years is OTCs at twice the price they are now, I'll just have a bowl a little less often. It won't cause me any severe hardship if supply stopped altogether, and my entire array of cheap pipes cost less than what some here would consider the cost of one mid range pipe. My pipe "needs" are far less than for many members here.
I consider myself to be familiar with BOTH ends of the cellaring spectrum with two different tobacco products.