why pokersites reveal winners real names?

[MarkGrandy]

I can't understand it !
I just login in WilliamHill and NoblePoker, first I saw
were last promotion winners names.
I never would like to see my real name revealed publicly like in these cases.
How can pokersites benefit that kind of action ?
I think it is more unfavorable.
Can anybody discover any logical explanation ? [img]/images/graemlins/confused.gif[/img]