Always fun to go through old sketchbooks XD I've always bought half decent ones because they definitely do feel a lot nicer to draw on, though I've never really splurged because I don't draw much (I have a sketchbook sitting in my drawer that will never be filled, the two that are in said drawer do contain a lot of sketches and notes for my project that I keep referring back to).
Very much unlike mine, all your old sketches look amazing XD
I'm glad you like them...naturally these photos are heavily curated.
I'd estimate that for every "showable" drawing i've binned 9 others.
That's still a higher ratio than mine, I don't think I have any showable drawings from before 2012 (I probably thought they were showable at the time, looking back now it's all ew no XD).