Actually, it's not fixed. I just checked mine now and you're completely right, all of the rankings have scores not divisible by 5. well at least that means we can all be number 1 (if we pay enough to get 50k tokens per day . . .), and we know what thresholds to target: 18-20k for third tier, 33-35k for second tier, and 48-50k for first tier. If you're not going to make the next tier in a given day, you might as well stop progressing or else you'll be wasting non-re-playable missions that are your only real source of tokens . . . no way are you getting 50k from playing the rooms 4 times a day, even at high levels.