Can't understand, is this campaign giving away BTC or stakes?
BTC. For example signature campaign is 40% of the 1 BTC. This would be 0.4 BTC allocated at the end of the 3 week period. If there is a total of 200 stakes at the end, and you earned 18 stakes (say from 6 stakes per week), then it is 0.4 divided by 200 multiplied by 18, or 0.036 BTC or approximately $400 at current value.
If there are too many or too little participants that would be heavily skewed beyond typical bounty payments, then we may adjust it accordingly to be fair.