That is a cheap translation of the spanish phrase: "El rio suena cuando piers trae"
In other words it is important to take in consideration the negative feedback as well. In fact, the people that gives feedback are the community itself.
I Believe that SharePoint Saturdays are fantastic opportunities, not only to learn something new but to get to know people.
Having an important group of known speakers helps a lot, specially on communicating the value of the conference. But I think would be wise for the community to make an effort for incubating new speakers, specially if there are new topics that are not being covered.