BarryW.
I have been working unpaid for several years, my choice.
In case you missed it
the point was and the point you neatly avoided was:-
"Almost a fifth of British businesses have admitted to using unpaid interns to "get work done more cheaply" and prop up company profits during the recession, according to a new survey"
There is a difference between making a difference to other's, against being used for the benefit of "get work done more cheaply" ?