In addition to there being no evidence of any drafts, and Joseph Smith likely not having enough money to buy large amounts of paper, we can also question how he would have been able to write drafts in secret.
Writing drafts of the Book of Mormon would have taken a lot of time and Joseph shared a room with his brothers which means he didn’t have his own personal space to write pages and pages of drafts without anybody noticing.
If Joseph spent hours writing the Book of Mormon before dictating it then surely someone would have noticed, he would not have been able to keep it secret from his family.
Why are there no accounts of Joseph spending lots of time writing? How would he have managed to keep his work a secret?