Thank you for the fast response @clorith.
but there’s no rules against this.
What has not happened yet, can still be.
I don’t see any reason why authors should rate their own product. These should – in my point of view – show user experiences and opinions about the theme or plugin. It feels just like an advertisement and not like a review since it’s from the wrong point of view and has no added value for other users. As you said, the own creations will always get the best rating from an author. There will never be a critical view on the products if the authors rate their own things.
Just my two cents.
Have a nice holiday/christmas time.