Never have and Never will, there really is no point, If I won on someone's Profile they would get the benefit, and If I lost then I wouldn't feel right losing money from another persons account, I did on one occasion let a Friend play a Game on my account, he called around for a Coffee and I was in the end stages of a game, down to the last three players, and told him he would have to wait for his Coffee, until I had finished.
He sat and watched as I went on to win and said "That looks Easy, Will you teach me?" So unknown to him I switched from
real money to my play money and registered him for a 2K buy-in, here I told him, have a go, So I went into the kitchen to brew a Coffee and he was shouting his
hands out to me and I would tell him to fold or raise etc, He didn't listen to me and inevitably lost, He was so apologetic asking me how much the buy-in was thinking he had cost me money and he nearly dropped through the floor when I casually said "Don't worry it was only 2K".
Play Money I added after a pause, "You don't think I would let you loose in my real money games did you?"
He never did take up the game, I think I frightened him with that stunt.