yep...saw them...refused to pay as I've previously fallen to the I'm-Saudi-need-money-for-gas-to-go-home scam a couple of year back.

very unusual to see street beggars in Doha.. please don't pay them as you're encouraging the behavior; People who need support can get it from official charities if they are eligible , and if you feel you need to give and support, you can also do it via the charities who will have their proper channels and have lists of people who need support.