You are entitled to your opinion and to voice it on a public forum, but said opinion becomes fair game for discussion and criticism whether you like it or not. That's how we develop ideas and critical thinking. You can choose whether you want to engage after the fact or not; again, that is entirely up to you.
IRM is no corporate giant.
Personally as a modeller I try to support both the likes of IRM and Murphys, that produce high quality RTR products for a tiny market that is often barely (or not at all) viable, alongside smaller producers like Des, John, Eoin and Leslie who are vital parts of our scene. As said above by Broithe, this is not an either or thing.
But does it come with realistic chuffing sound?