I see many faucets with this template
http://yourfaucet.net/ that pays a good amount of satoshi sometimes and suddenly they pay 1 satoshi per day. However the balance is fine, why do they do this?
Its pretty simple, they wanna get users to visit their site frequently in the start to get traffic so they can earn from ads, then they just decrease the value because they dont want to waste money, but the traffic is still flowing into their site because of the previous good rewards so they still earn