It's a glitch in the game. If you can get him the money, he will send you prothean/collector technology that will allow you to construct Prothean armor and weapons that go far far beyond uber. They do require a fair amount of minerals to construct, though.
If you send me your credit card information, I'll walk you through how to unlock these items.
So now you see that evil will always triumph because good is dumb. - Dark Helmet