I hate people who say that when authors write a lot of books they’re doing it as a “cash grab” like, do you know how hard it is to be an author? Unless your book is pretty popular you’re practically broke all the time. So duh, of course if their series is doing really well and people like it they’re going to do a sequel or a prequel or something.
Also, they enjoy writing??? That’s why they became an author in the first place???