The problem is that there is no connection between someone giving me that dollar and the value of my company; just because they say that they are giving it to me because they value my company at one billion dollars doesn't make it so. Maybe they are doing it to be funny, or to prop up the value of my company. They are only sacrificing a dollar, so there is no real cost to them. It also has no bearing on or indication that anyone else would also value my company at that much.