I think the purpose of me getting one was so the other half wouldn't have to carry bags full of heavy books to and from the library
I do get your point but at least in my life that's not how it works. For example I take pbooks camping all the time but wouldn't do that with my Kindle, so don't have an issue with not using my e-reader everywhere, when I don't have my Kindle out I have the Kindle app on my phone, so I still have an e-reader, just a more inconspicuous one.
I'm sure the situation will change in the next few years as e-readers become more common I will become more comfortable, but at the moment I live somewhere that still thinks the internet and especially broadband is some strange new fangeled thing.