About PTC sites....

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Can anybody explain to me how PTC sites compute their payments per click? Let me give you an example. In Donkeymails.com, each inbox you received and clicked is worth .05 cents. does this mean a quarter of a dollar? you see, I initially thought it was but my earnings will just show $.0005 or something like that. when i cashed out i received only $1.05. I have clicked a lot of inbox and if each is worth a quarter of a dollar then i'd have probably earned a lot more than $1.05..this is my first cash out and i still am not familiar with their computation. i just signed up for kicks without really understanding the rate. please help!