Bitminer.io, bitminer.eu and all sites with the same scripts I have seen is scam. It doesn't pay with and without investment.
But me i already withdraw my balance there before directly in my xapo wallet, but now i am not active in claiming in faucet because i am too busy in my job, bitminer is one of the good faucet for me specially if you have more time for that site.
THATS a BIG SCAM the don't pay anything...