Imo a higher rate wouldn't be bad, because the current price of Bitcoin is really low. Also, it's the aniversary of 1 year of this campaing, so we could do with a higher rate for celebration 
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+1.
Yesterday (after the bitcointalk crash) I've made a comment with my opinion. Personally that's one of the best campaigns because of the automated system, but it's obvious that to celebrate the 1st anniversary and to make an improvement for their members, BITMIXER.IO team can consider a reward increase.
Actually, Bitmixer moves 25000BTC/month in their mixing service.
There's a 0.5% fee, so that's approximately ~125BTC/month (profit). Remember that you can add an extra of 0.0005BTC for every forward address added on the mixing process.
Assuming that stats + the current stats from the BITMIXER campaign:
- Number of registered users: 365
- Last 7 days total payouts: 2.47512917 BTC
NOTE: Remember that this is just an opinion, I like the campaign and features like the automated system, this is just a suggestion comment!
Stats sources:
- Bitmixer interview // coinprices.io interview: https://www.coinprices.io/articles/the-essential-role-of-mixing-services-bitmixer-processes-25k-btc-per-month
- Bitmixer fee: https://bitmixer.io/fees.html
I don't know if this exchange is making as much as Primedice or similar, but back in the time when Primedice was open beyond Staff member one could make like 0.4 a month a Sr Member, more if higher; not sure how many active members they had but take into account the price per BTC was much much higher. So yeah I would like a small raise. In any case I love this signature campaing for the automated method which goes really smooth.