I'm not in leaderboards so I don't really have a strong opinion on the leaderboard prizes. They don't seem particularly problematic.

However, if the team is building an "post season tournament" for which the leaderboard is the qualifier, it sounds pretty cool - Playoffs!

So cool idea but I can see some ranked players may not be interested. Maybe if the tournament is fun, and KYC'd or something, it could be like the Superbowl!
You just give X number of leaderboard winners a "participation token" which they can use to register and participate, or they can give away or sell if they don't want to battle for a Superbowl Ring!

Anyways, like I said, I don't have strong opinions for or against, but it does seem like it would be a bit more e-sportish to have a Superbowl

But I would like to see changes to the Ranked system:

@shadecroat gave some ideas here, and @kalkulus improved on it with his response
(i.e. calculating Rating change points using a permanent, non-resetting Elo score that is separate from Season Ranked points)