His low point, I think, was when he published a vid last summer - now long since removed - torching all the other shoutcasters in comparison to himself.
I didn't know about that specific cast but I can imganine that ppl get angry when something like this happens. Nevertheless narcisim seems to be a problem for some ppl in the community (casters and likewise top players).
That's fine though because despite growth I'd say that the audience you capture matters just as much. What's the point in 1000s of viewers if they are on average less passionate about the game? But that's fine because someone has to capture the casual player market, and that's what Krebs has done. He enjoys the more casual side of CoH and caters to fans of it.
There was this article by IpKaiFung about how to make coh huge and I think what was mentioned there can be applied here to some extend at least. I understand that core gamers dislike the idea of their game becoming casualish and easy to master (something most if not all major studios try to accomplish because of obvious reasons). That's why it is so important to have ppl that make competitive games more accessable and enjoyable for new players. Most casters I have watched (you are an exception f.e.) don't bother talking about the little tricks the established playerbase already knows about but Krebs does and I think that the game benefits from it.