Don't think that this hasn't crossed the mind of some execs. Clothing companies have already figured this out....see all the 'Tommy', 'Old-Navy', etc T-Shirts walking around. I think that if a company wants me to advertise their product, then they should pay me, rather than the other way 'round.
I firmly belive that the execs at my old company, if it wasn't for all of the sticky legal implications, would have killed me and sold my organs on the black market to save a few $$ on their bottom line.
They probably had an appraisal done and found out it wasn't worth it.
< ]B^)