Player rating for tournaments across all installments of Heroes.

I don't understand why the rating should provide some kind of support to someone. If all participants are strong, and there's only one weak player, the tournament's strength is high, and everyone should receive a slightly higher rating (both the strong and the weak). And if the tournament's strength is lower, everyone will receive a little less. As a result, a weak player in a strong tournament might gain a little more than a player of the same level in a weak tournament. Why do we need to artificially inflate someone's rating?