How come not many hits

Hi there i've entered alot of bills and i mark 90% of them but ive only gotten a few hit why is that i look at some ppl and they have hundreds of hits.

My guess "was" that you never marked the bills..
But another reason is that $100 bills are not circulated nearly as much as $20's and $5's
A final Reason is Luck..
i already have 8 hits which i am very surprised at

TRY TO MARK MORE 5'S. THAT IS WHAT IS HIT ON THE MOST.

you know raceday16 I had entered maybe about 150 or more bills and wondered why I was not getting hits and then all of a sudden I was having one or two hits a day for awhile and now I have almost 1600 bills out there and have gone into a lull so you never know.