My only problem is that it gives people some senses of rigorousness, without actually providing it. I could say the chance of extraterrestrial life is .4% pull

My only problem is that it gives people some senses of rigorousness, without actually providing it. I could say the chance of extraterrestrial life is .4% pulling that number out of the air, and you can use the Drake equation and get .99% but you know what -- both are made up #s and yours is in no way more accurate than mine, but because of the use of an equation people will think it has scientific merit and is more rigorous.