well thanks friends for your replies.
actually, its true .. i can figure out easily who make a mistake by error and who make it stupidly.

@smart,about the infraction cost,, mathematically its not the same.
my forum is better than mmk in the following :

1-more than twice of their rates
2-less effort to make 10 posts than 20 posts
3-earning $1 instead of $0.6

so whatever, you calculate by time,earnings,effort..etc
I am still the winner,, so it deserves to have a higher cost per infraction.