The canon, or list of books, in the Bible was finally settled around 400 AD. At that time, it had to be written by hand on vellum (animal skin) and it took three years to write on. Consequently, it also, cost about three years’ wages to buy one.
A house today costs roughly three years’ wages (or more for a lot of people) and I doubt they offered Bible mortgages back then. So how many people do you suppose had a family Bible before the printing press was made?
Not many. That’s why the Catholic Church devised the Lectionary. This little device is a schedule of readings to ensure the entire Bible is read in three year cycles. So if you go the Catholic Church daily for three years, you’ll hear virtually the entire Bible; plus many important verses are repeated yearly so you’ll get extra doses of those. This was done so everyone could hear the Bible with nothing left out.
Plus, up to the time of the printing press, literacy rates were very low. Owning a Bible wouldn’t guarantee you could even read it. I know I’d never buy a house I couldn’t live in, when I could get the same benefit from the Church for free.
The idea that a person could be “saved” by the Bible alone and outside the Catholic Church was unheard of until the fifteenth century. Not because of Catholic oppression, but because Bibles were scarce, expensive, few people could read, and it was faithfully read at Mass every day.