I've been playing for 3-4 years and have only gotten 2 $20 prizes. I wasn't sure it was even possible to get the 10000.
I have 45000 rolls and won 20 $ one time.
I hit 9999 twice. Last year in June and this year in January with 15814 rolls so far.
My referral got either the 98 or 99, 20 USD, that was a nice referral take.