You are all being unfair to Jim, kiddies. All he is pointing out is that you have limited control over the auction process in a system of supply and demand. If someone wants something badly enough, and has the money to pay for it, he/she will pay as much money as needed to to satisfy the want.
You can form a 'cartel' of Sparta owners to reduce or stop bidding against each other and thus keep the price of parts down, but your ability to do so is limited to your little group and your your ability to keep each other in line. And that will break down when there is one essential part left and two people who need it.
I'm really surprised you people don't know basic economics; it would save you from having to start, continue, and endure such moronic threads as this one. To someone with a basic knowledge of how markets work, this thread (sorry, andrew) is on par with "how do I make my mind go dumber."