When I was eleven years old, I bought two 45's with saved-up allowance. They were fun, but I started buying albums immediately after that. I guess even then, I was about exploring what a band was all about, not just the hits. I started my paper route shortly after that, and made $22 a week, which was a lot of money to a junior high kid in 1973. Albums were about five bucks each, so that was four albums including tax, per week. In my 20's, I bought a third 45 because it was a song I knew and loved and they were a one-hit wonder, and this was still long before mp3's and Internet downloads, so I had to nab it. That's it. I own three singles and hundreds of albums.
I never bought albums on cassette. I bought blank cassettes and recorded albums onto them. The vinyl was better quality for at home, and a good C-90 gave you better quality in the car, so win-win. You found two albums that went together and put one on each side.
I didn't buy my own car until I was 20, but the first thing I did was upgrade the sound because factory audio back then sucked. It was a Sony FTU-32 Auto-Reverse cassette deck with "high-power" sound. It's all about the music, baby. Always has been.