What makes you conclude this?
The link I gave in the post has some of it. I've just been studying this as part of an OU course. We can calculate reasonably well the mass of material that fell on the earth around 4.5-4 Ga ago, although the quantities of amino acids contained in this material is more open, it's certainly not large (or we'd be detecting it in modern meteorites in large amounts), and there is good reason to believe most of it is destroyed before reaching the Earth. The oceans on the other hand, are very large, sticking the numbers (some of them guessed at) together you find that the chances of just two amino acids coming into contact mean that it would happen once every 10,000 to 100,000 years. That's simply not enough to account for the origin of life.
I find hydrothermal vents a much more likely source of organic compounds needed to form life; bubble theory also seems interesting.
BtW are you the same cat avatar Mr Jack I just saw on the RPGNet forums?
Aye, that's me.