MichaelSullivan
Maester
Unless, I would think, it's part of a long term strategy of creating enough bodies of work that suggests legitimacy. I often hear that authors didn't start selling until their third or fourth published book.
I've always said that "Three is a magic number" (and even have a post on that fact). So yes, you have to get to that number before you can expect much in the way of success. But...and here is the important point. All three of those have to be at that HIGH QUALITY INDISTINGUISHABLE level. If you put out something sub-standard as book #1, no one will read book 2 or book 3. So no - I can think of no scenario where it behooves an author to put out anything that isn't the very best it can be.