My TBR stack is about 2-3 years, I hope to get it up to at least 5 years. Like buying groceries, It is just so much cheaper to stock up when the prices are low than to buy day-to-day. I still buy some at full price to read immediately, but usually only after they have been sitting on my wishlist for a long time with no sign of a price drop, and I just can't wait anymore. There is also a small but growing list of ebooks that I regret not buying when I had the chance, as the publisher has withdrawn them from sale (perhaps after the rights have reverted to the author or author's estate) and they are no longer available at any price.
If I was much younger it might be a mistake to build a large TBR stack, since my tastes might change. But I've been reading science fiction as an adult for about 25 years so I have no problem buying books by well-established authors to read in 5 years, although with other genres or with new authors I try not to buy that far ahead.
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