That idea might need to be tweaked a bit...
#2948 (at the time I was on) is Saudi Afghanistan. By your idea, he would be taxed 1%.
#1 is the Greater German Reich. So how much would he be taxed? Having him taxed 2947% seems a little unfair, doesn't it?
Instead, perhaps some categories i.e. 2000-1500 score loses 10% revenue, 100-0 score gets 10% revenue, or a special "noobs" government mode only available before score 250 would be better.
And also how would this be fair to the older players, who have spent time and money in some cases getting there? If you're a noob at a game, you will have to work at it and become better.