I actually buy more books now that I have a Kindle. It happened like this: I know that the Kindle is a doorway into reading all the novels and non-fiction books I ever wanted, because they can be freely downloaded from LibGen. At the same time, the Kindle is an absolutely terrible format for reading poetry: often poetry relies on elaborate typesetting that EPUB/MOBI doesn’t support, some editions of poetry tightly connect the poems and the paper and binding used, etc. As I reflected on this, I was inspired to set about building a huge home library of modern poets’ collected works; basically any name connected with the 20th-century canon, I have bought it or am planning to buy it. I probably would have never thought to do this if it weren’t for the Kindle!
It's actually gotten worse for me with the kindle books... we often get e-credits from Amazon for asking for a day or two latter shipping arrival, and these pile up, and they expire, so... Hey, got $8 off on an ebook, I have one I want to read eventually, so let's get it, and... another on the pile!
I now collect "sample chapters" on my Kindle, rather than buying new books. Highly recommend that approach - in my case most of the time I don't want to continue after reading the sample, so I move on to another one.
I guess there is just something about a physical book that makes it desirable outside actually reading it.