Well books don't expire or anything so i don't think it's a big deal. Maybe just keep a TBR list instead of buying them, and waiting until your pile is reduced a bit before actually buying them. That's what I do

I buy exclusively cheap used copies. If it's a book that becomes my favorite, i might invest in a nice hard copy, although this only happens with a few books

If I'm unsure of whether or not I'll like the book, i will find some online copies of it and read the first few chapters. But i tend to stick to classics so that's not much of a problem.

Reading is meditative for me. A good book demands 100% of my mental attention so I'm unable to pay tax to all the bullshit in my life