For many of us, it is not always easy to keep up with all the things we "should" do when it comes to asking for reviews.
If you have a website and you are just sitting there hoping it is working for you, good luck with that. It takes time and effort to maintain a web presence, and one of the ways to keep you moving up the search engine ranks is to have things like reviews on other popular sites that link to yours.
I know I have to figure out more of this (or get Paul to help) for my site. I do get calls from people searching, not a lot, but some. Just have to keep at it.
We would rarely ask a client for a review if we did not think they were going to say something good, so having 5 stars should not be a negative. All we want is to have a few clients post a couple of things they liked about our work or service so others that may be searching have a general idea that we are pretty good at what we do.