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Most books see 80% of their sales in the first 3 months, and are removed from the shelves at the end of that period. So as Tompe said, it's best to buy it when you see it because you may not ever see it again.
This is also where DRM hurts. As of right now there's no guarantee that either the authorization servers will still be up or that the book will be available for re-download in ten years, and authorizing a new device for mobi requires that both conditions be met.
At least with eReader you can archive everything if you want to buy now but it doesn't end up at the top of your to-read pile for years.
I know I buy SF e-magazines more regularly than I read them - then read a lot in one fell swoop.
I try not to circumvent DRM these days, but it's an extra level of hassle that I'd prefer not to deal with.
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