I think how Bry explained it would be best.

Starting point Value: Choose between 1,000 - 20,000 (Maybe choices like 1,000, 2,500, 5,000, 7,500, 10,000, 12,500, 15,000, 17,500, 20,000)

Bonus Points: Choice between 0 = 500 (maybe choices like 0, 50, 100, 150, 200, 250, 300, 350, 400, 450, 500)

So the most "unbalanced" game would be start with 1,000 points, and can get up to 500 bonus points - which is how many games will be towards the end of the game anyway!