I saw the thread on Altcointalks, their payrate is much lower than what was offered on bitcointalk. The top quality posters who were in such campaigns will think twice over going there to promote it unless the pay is compensated in some other form. I am sure the managers are doing well managing this and since I am not willing to add in another account to that forum, I will stay here and focus on the issues on this forum.

Not sure how some of the members can manage two forums at the same time. Kudos to those who can!

Payrates are not constant and they will be changing though. If all mixer campaigns move in there together with participants, that would bump up the traffic and activity, which could lead to higher payrates in the future. There will also be more competition between mixers, which now don't have that many places left they could advertise on.
And when more btctalk members are aware they could "teleport" their ranks to altcointalk and apply for extra campaigns to boost up their earnings, the traffic and payrates could also go up.
From participants' perspective, even if the payrates are lower, they could still apply for whatever campaigns are left on btctalk. Definitely better than not having any income.