Crown
¯\_(ツ)_/¯
People will probably take this the wrong way, but I personally would not want a horde of subs from YTTalk, because it seems like they're more obligated to watch and comment out of either trying to be nice or so you'll return the favor.
I know what you mean and I agree to a certain extent. It depends on the type of content though I think. For a channel like mine, I don't even bother promoting on YTtalk (no vid in sig etc) because, for the most part, YTtalk members are not my target audience and so I am here to discuss video creation, not to find subs. I put a video in my sig a while ago to see and yeah I got a few views, but the audience retention was much much lower than what I was getting from elsewhere (makes sense) so I decided to pull them.
But for channels which are less niche and have more widespread appeal like comedy, music, even some vlog and gaming I suppose, then I think YTtalk is awesome for bringing in some new viewers and even if they don't remain long-term active subs, they will recommend them to others when given the opportunity.
I have checked out quite a few YTalkers' channels and when I like what I see, I make it known and do what I can to spread the word and it's not a case of being over generous because they are YTtalkers but because I genuinely like their content.