This must be unique to your "tropical/subtropical humid climate" because surveys consistently show the vast majority of books bought by high school kids are print, not electronic.

In addition to data, I'd also like to offer some counter-anecdotes: I have a large collection of printed books to which I'm still regularly adding, I know many other people who do also, and I can only think of a couple of people who've told me they've stopped buying printed books and do all of their reading on the Kindle.