Interesting discussion about "provable fair".
Why not use a fixed amount for each claim? Or are people really only using the faucets hoping to hit one of the top prices?
I myself like Bitcoinker the most. Every time the same amount, minimal number of clicks, no pop-ups and never "insufficient funds".
But if you really like the variable prices, post it, because I would like to know. Post your favourite faucet and let's see which one is most appreciated.