First second and third place rewards?

I was in first place for bluebikes this month and expectedly earned $750 + $100 =$850.00. 

I spoke with the third place person who said she only made $300 and was expecting $350 for third place (AW708). 

Is only the top point getter for the month getting extra money? I thought it was top 3 received $100, $75, $50.