I did expect them to talk because I read, and also listened in this video, that users are thrilled to talk with the founders of the product they use.
I can understand what you say about unhappy users, they are the hardest to establish a conversation with, in fact, I had yet no luck with them.
I also try to contact my most engaged and paying users, very little luck there.
So, either everyone is laying (very unlikely), or I'm doing something wrong.