The average loan officer usually makes a 40%-90% commission with no salary or hourly rate. The difference in commissions is usually based on experience and whether or not leads and/or advertising are provided by the mortgage company.
The parts of the loan that are generally considered for the loan officers commission split are:
If your mortgage loan is $300,000 with a 1% origination fee and a YSP of 1%, your loan officer is more then likely making between $2400 and $5400 (40%-90% of origination and YSP) off your loan.
On a $1,000,000 loan with 0.5% origination and 2.5% YSP your looking at the loan officer making between $12000 and $27000 (40%-90% of origination and YSP) off your loan!
A good estimate of closing cost is 1% and 3% of the total loan amount. The secret to keeping those fees as low as possible is to arm yourself with the information needed to make confident and intelligent decisions and to keep a close eye on your credit report.
You can ask all the right question about your mortgage loan, but if you have no idea what the right answers should be, you're only going to make it easy for dishonest loan officers to take advantage of you.