Honestly, I'm already "locked" into the Amazon world by them having the best e-book reader that I've owned for years (though removing DRM from Kindle books is very easy).
I'm very unlikely to ever read this type of book again after I finish it, so needing it on a non-Kindle format if I were to ever switch to another e-reader is not that important. And unless there's a lucrative, legal resale market for e-books that I'm unaware of, there is really no point in even keeping the file around once I'm done reading the book.
Okay, valid points. But IMO, for an opportunity to vote with your wallet, $2 is as cheap as it gets (not that one sale will change much, but it is a step in the right direction, regardless of how easy it is to strip the DRM).