Just spit-balling here, but a cool reward for those who do well enough to stay in League A would be to directly chose a map or template to be used for the next season (provided it's determined to be strategic), starting with the 1st place finisher going down the line choosing in order.
The trouble there is most clans would probably choose some template they play internally that the others have maybe not played at all. So you'd have 7 of the 11 templates that are perhaps not widespread used.
A better approach (IF everyone liked the idea) would be to weight the votes based on finish. So like A1 votes are 7 points, A2 = 6 pts, etc.
If you did that, you could extend the votes to every single clan, where the winner of A is the most and the loser of D is the least.
I will submit these to the panel, as it would require a vote by them to change the rules (I don't just make changed myself).