I use my wish lists for things of the "hmm, sounds possibly interesting, maybe some day, especially if it happens to get cheaper" kind of books.
I have several hundred books on my wish lists and I occasionally go and cull them (of books that have stopped sounding interesting) and also to see if anything there catches my eye more than it did before.
So for me, a wish list is for the "maybe" kinds of things - and also for books that cannot be preordered yet (e.g. hardcover is listed, Kindle version isn't yet).
I can't really see why I should wishlist books that I will read, with certainty, as soon as they are released, when there is a far more convenient option to just preorder them - and at least on Amazon, this may well mean that I'll also get to take advantage of any (often temporary) price drop between preordering and release.
I do see the point of wishlist instead of preordering for those who have long TBR lists (so do I, but some books take precedence) and don't really care enough to want any book immediately. The overwhelming majority of books I read fall into that group, too. But for those I count down days to? Those I can't WAIT to read? Those that I know I'll set everything else aside for in order to read it the moment it's out? Of course I'll preorder it - there's absolutely no reason not to, after all.
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