i agree with you timezone but far too often you *can't* buy an ebook, because the one you want to read is not available in ebook format. that is when this letter comes in handy. i think it's important to vote with your wallet, but *also* to explicitly tell publishers we want ebooks. they might not realize it, otherwise.
as for this letter being ignored because it's seen as a "template", 1. it's quite possible that we will all write to different publishers, so it won't be a problem ; 2. i encourage people to personalize this letter as much as possible, 3. however there are a lot of people who might not write *at* *all* without the help of a model letter because they don't like to write, so this letter can be really helpful for them, and 4. even a form letter is better than no letter at all.