Can You Expect a Ghostwriter to Include Revisions?
This is completely up to your agreement with your ghostwriter, but be careful that this is spelled out before you start.
You may get a very low price on writing a book, but revisions cost this much per page or per chapter, etc. On the other hand, you may pay a very high rate to someone willing to offer unlimited revisions.
In fact, I think every ghostwriter ought to provide for at least one set of revisions for each chapter, but again, make sure this is spelled out so you know what you're really getting.
I'm no longer taking on ghost writing projects myself, but my rates used to include up to 3 sets of revisions per chapter. If you need more revisions than that with any ghostwriter, then you might not have the best writer for your needs. (This should have been determined ahead of time, though, with a custom sample if possible and generic samples at the least.)
Once you have approved a section of the book and the writer continues on, if you then request new revisions in the earlier section, that could mess up everything the writer produced AFTER your first approval. So in that case, you're creating more work based on YOUR error ... not the writer's. If that happens, expect to see some additional fees unless the extra work is minor.
Any included revisions, though, can only be included if the writer was offered all information up front - for the same reason as above. If a writer produces 10 chapters of your novel and then you throw in a new character that was supposed to be introduced in chapter 2 - the writer has to start all over again, and should not be expected to swallow all of that time.
Again, what a ghostwriter offers can vary. Just make sure to be clear on the agreement, and to be comfortable with it. The cost of a book isn't a very good cost if a bad first draft means twice the cost in the end. ...