I think getting a total bonus of 100 X however many people you defeated is the best way to regulate it. It makes it more simple as a gauge around the board, remember that there are a lot of tourneys that spring up and people choosing their own values for the victory could skew the leaderboards. Where-as no one can complain that whatever the circumstances beating multiple people in a row deserves an added bonus, and it will regulate itself by providing more of a bonus in individual tournaments based on how many people you yourself faced and defeated.
And ultimately, someone who wins a tournament (with the average number of people you have to beat to obtain victory usually falling around 3-4) probably deserves 300-400 points outright, that will set them above the rest, but they would still be reachable within double that many individual victories (which are easier to obtain after all, not requiring the win streak.)