Just an idea.
What do you think if a campaign appears in which 16 people (or 100) will participate?
But only 1 user will receive the payment weekly. That is, by means of raffle, a winner will be determined who will receive the entire amount of the campaign’s weekly budget.
I wouldn't want to participate in such a campaign, too. This is too much gamble for my taste and statistics could make you have to wait for a really long period until you win such a raffle (potential for quite some frustration; something I'd rather not associate with a campaign).
Then there's indeed what Turbartuluk mentions how to account for the posting quality and quantity of each campaign participant. I see no easy and fair solution to treat everybody based on their contribution during the campaign.
I'm not very good at statistics but if you actually do such a campaign, what do you think of the following additional rules?
- a raffle winner takes it all but then has to leave the campaign forever
- the freed spot by the last raffle winner is of course replenished by only one new participant
- total number of participants of the campaign is constant with a fair and not too high upper limit
Just some ideas I had while thinking over such a campaign proposal... (I still wouldn't want to participate even with my suggestions)
Ich freue mich für dich @MinoRaiola! Hätte aber nicht geglaubt, dass noch ein Dritter aus dem deutschen Bereich aufgenommen werden würde aber da sieht man eben, dass die deutschen Poster 1. beliebt sind und aber vor allem gehörst du zu den qualifizierten Postern in unserem Bereich und damit bist du eben äußerst begehrt bei BM‘s. 
