I don't think it should be 1 point per fight, the points should be given based solely on the fact of a completion bonus (As in prior tiers are completed before the one you fight) and then the tier.

So let's say you have up to Tier 5. Tier 5 will give you 5 points because of its difficulty, but then if you took the time to get the other tiers prior to it being completed, you get a few extra points for your effort. This'd get people some stuff fast than doing 2000 fights, but you gotta do the content to get the clink clink