Harry Potter

The mechanic of catching the snitch immediately ending the game is a pretty good one, and there's several ways you could go about it.

• Adds no points to either side: you want to catch it when your team is up, but if you find it when your team is down, you want to misdirect the other team's Seeker

• Adds a small number of points to your side: you want to catch it when your team is within striking distance of a win

• Adds a small number of points to the opposite side: you only want to catch it when your team is up significanty

My favorite would be a random or rotating points penalty. Like say every 3 minutes the points given to each side upon grabbing the snitch is randomized. It still allows for that stupid main character syndrome special boy causing the win thing, but it doesn't completely break the strategy of the game.