I think it's safe to say they should be raising their rates. The campaigns paying 0.010 per post or something like that, should raise to a decent 0.013 like DaDice did. The price is only getting LOWER so this is nothing but a scam at this point. Remember that things don't change as long as you keep accepting low payments, the business rulers will be happy to keep rates as low as possible without people complaining.
Current payout rates of the most big names signature campaigns here are the rates when BTC are in $230 mark. Now we are around in that mark again so I will say that payout rates today are just fine except for those campaign that gives really low payout since the beginning.