It seems like dailybitcoins.org gives away 5x what you do as a MINIMUM.
No it does not! they allow you to get coins once in 24 hours. I allow you to get coins once every hour, you can get coins 24 times per day on my site. NOW go get some free coins DAMN IT!.... lol.
Per use I am correct. They give away about 1/4 of a penny per use. You give away about 1/20th of a penny. I tried your site out to see if it works, and it does. But I do not go back to dailybitcoins.org for 1/4 of a penny, I am not going to go to yours for 1/20th of a penny.
You should tweak the model, offer larger random payouts, or do something more unique then just more payout chances per day.