for me mooman points grid is good
if points are only for top5, noobs cant get recs and wont try to be better racers to get new recs. But with top20, many racers can have recs and it's good for addicting (is addicting a good thing ??) so it's good for the server.
other way , rewarding top1 ( 2 , 3, 4 ..) is much fair. so big players like me or dabar wont be higher than better racers.