Google pays that money. The rational is probably that someone from Brazil (say) will not make google too much money even if they use google more often after downloading firefox.
$1 is the max...and if not from usa, then you get 0.10 irrespective of country. so only 2 payouts are possible. $1 or $0.10
I heard that for some country, we got only 0.1 USD, like me, But if in USA, It's about 1 USD Am i correct?