CHIA was formed as a collaborative effort after what seemed to be little to no response from CSA on the thousands of comments offered to invoke change in the draft document.
As far as there being a conspiracy or act to subvert a selection process to my understanding it was largely based on inviting heads/chairs or presidents of Canadian home inspection associations. Several of those people selected also sat on the CSA Technical Committee. The goal being to solicit first hand discussion on what concerns home inspectors had with the document.
As Pat stated it was simply to present a unified front to invoke change.