There are a few factors at play here. You have to first recognize that the music industry in the first half of the 18th century was not what it is today. In order for a composer’s music to become well known, a pair of factors needed to come into play: First, that composer had to have a great publisher. Publishing was expensive in those days, and involved very careful and painstaking engraving of each note and staff. It was even more costly than printing text, and significantly more expensive than hiring a team of copyists to do it by hand. So, the publisher needed a really REALLY good reason to run things to print and distribute them. Oh, also, distribution was a horse and carriage. So again, really expensive. And SLOW. By the time Bach reached his apex as a composer, there were composers of secular music (Vivaldi, Handel, et al) who had better publishing deals and better court appointments. Bach was a church musician first and foremost, and by this time the style he was using for chur...