Freelancer Stats

[#1]

A client hired me for a contract but then never assigned me work.  Is this affecting my job success rate?  Or clients that would recommend me percentage?

Similarly, I accepted a very small ($10) contract.   I doubt client bothered with any feedback.  Is this negatively impacting me?  

[#2]

And a follow up:  I have an ongoing contract.  The client gave me a favorable rating and review several months ago.   I'm not about to ask them to review me again because it seems the only time they can is when they end a contract.  As I'm not getting any feedback, is this considered "excessive lack of feedback"?