Everyone has personal reasons, and for some people I'm sure there is no reason to root at all.
For me, it was worth doing so that I could use it to access email in an emergency when traveling. I can't do that with the phone I have. It's come in extremely useful on multiple occasions for that purpose.
Since I had it rooted already for the email access, I went ahead and installed some other apps -- puzzle games (not animated, so they work fine on e-ink), an improved PDF reader, and an app to transfer files more easily from the internet to my reader, to name a few. I don't use them every day, or even every week, but I'm glad to have them.
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