Shahab, you're car is probably not higher because it's still completely stock, and I know some people on here vote based on your modding, for example jrhaile said I lost a point because I still had my stock rims so my look is incomplete.
///M Speed, you're is probably so low because you're new on the system so you don't have many votes. It's a balance of average rating and number of votes. This balances it out so a new person can't join, get a single 10 vote, and be above the number one person who had a rating of 9.62 from 193 votes. You see what I'm saying....?