When we stop collecting books for the bookshelf, it's time to collect eReaders. Otherwise, what will we put on our shelves or stack into our rollees when we travel?
I plan to buy a 650 in addition to the Kindle. And, if I were to see a different eReader at Target for $40, you can bet your booties I'd buy it. Eventually, I'll be able to loan out my readers instead of my books!
But to answer your initial question: Yes, of course you are crazy!