This isn't my boxing match, but why should Chipmixer campaigners get a reduction in payment?  They're for the most part the cream of the crop as far as bitcointalk members go, and sometimes you have to reward talent with a higher than normal compensation. 

Besides, bitcoin is down from its ATH significantly and if I had to wager a guess I would say that Chipmixer can well afford to keep the campaign going just as it is.