My sister read the BSC books... or at least, my mom bought pretty much all the books she could find for my sister, lol! The books filled up two and a half shelves on the big bookshelf unit we had at the time. My mom mostly bought them in boxed sets, and multi-packs through Scholastic book orders that we would bring home from school. My sister never read all of them, she lost interest in things very quickly, and wasn't much of a reader then, anyways.
I was the reader in our house, and I started to read some of them out of boredom. I got through the first two or three (maybe more than that, I don't remember) in a few days. I read about one BSC book a day; I remember my sister getting mad cause it took her a week to read just one. I can't help it I hyper-focused on books back then (takes me forever to read now, if I even finish the books), lol.
But they didn't hold much interest for me, so I didn't get very far into the series. I was more into fantasy and science fiction as a kid, so reading about ordinary kids didn't really appeal to me much. Plus, even though I liked playing with some "girl" toys, I just wasn't much interested in reading about a bunch of girls. I had to deal with them enough at home and school!
I don't begrudge anyone else for reading or liking them as an adult. Heck, I read books of all kinds nowadays, including series intended for "kids".
>.> *coughWarriorscough* <.<