Just came here from the User Messages feedback. I bought User Messages 6 months ago on the impression with the free plugin. By all appearances I am stuck with that version despite guarantees of updates until the next major release. Those who unequivocally support marketing of "premium versions" should keep this data point in mind. I was neutral on the practice but this experience has (re)awakened me to the reality that nothing is idealistically pure or can be trusted. I will be exercising quite a bit more caution in promoting solutions especially for clients, since I am trying to be a "maker", not "taker", in my new life as an entrepreneur. And I value my credibility.
For the record, I am on the side of segregating the marketing ploys. A strictly commercial channel would have a clearer course of recourse in the event a product does not perform as advertised.