The problem is there isn't much of a middle ground. You are either really profitable on your server.
40 win streak nets you roughly 4mil+ credits.
37 wins with 3 losses nets you about 400k. (getting 9 win, 1 loss, 9 win, 1 loss, 9 loss, 7 win)
38 wins with 2 losses nets you about 900k. (16 wins, 1 loss, 16 wins, 1 loss)

I think it has to be evened out more rather then just flat increase the rewards as there are some servers where people go undefeated or 1 loss every night and they make a killing out of it.