I have this same problem. I've bought a huge pile of eBooks -- sometimes because I get inspired to "get into" eBooks, and sometimes because I just crave the instant gratification -- but I always, always forget about them.
I wonder what it is about the folks who are able to "get into" eBooks. Logically, I know all the value props -- great for travel and general minimalism, easy to highlight and search highlights, better for the environment, etc, etc -- but, for whatever reason, I just can't get my brain to do the thing.
On balance, I think I'm okay with it. I spend an enormous portion of my real-estate budget on books, and, frankly... what else would I spend it on? That's one of the key things that it's for, if you ask me.