There is your problem right there.  The top 3 countries aren't worth anything for advertisers.  Every time a user from Russia, Ukraine, or Venezuela makes a claim the site loses money.  There are simply no legitimate businesses in those countries paying for advertising in BTC, and a faucet needs advertising income to be able to pay users.

This has created a makers/takers situation.  Most users on the site are takers, because they take more then they earn for the site in advertising.  Makers subsidize the takers by earning the site more profits then they claim.  Eventually the makers start to leave because they aren't getting paid enough, while more takers continue to sign up.

This site could easily be fixed with geo-targeted rewards, where users earn an amount based on the advertising income that they personally bring to the site.  Users who are not profitable to the site would get paid less, while profitable users would make more which will encourage more of them to sign up and be active.