Had Ann M Martin wrote all the books herself had not hired ghostwriters, how do you think she the BSC series would have been different? Would she have ended them much sooner? How many books do you think she would have published each year? Do you think she would have kept the later books more of a similar feel to the earliest ones or that the books would have still gotten increasingly more outlandish over time?
Here are my personal thoughts:
She would have probably published them at about the rate of 5 or 6 regular books + maybe one Super Special per year so they would have come out at a much slower pace. They would have graduated from eighth grade around book #50 and then there would have been maybe 3 or 4 books about the summer afterwards (including one Super Special).
She might have ended the series with a book that takes place at the beginning of their freshmen year when they realize that it wouldn't be practical to keep the club going into high school (similar to Kristy's Worst Idea but they follow through with disbanding the club). AMM wouldn't have had the time to write all the spin-offs and the BSC books simultaneously. However, after completing the BSC, she might have started on 'California Diaries' as Dawn's freshmen year of high school (Dawn wouldn't have moved back to California until right before her freshmen year, and there would have been no Abby).