You just gave a perfect example of the economic principle of supply and demand. Why pay a certain price for a commodity that is abundant when you can spend the same amount on a different commodity that you may not need as badly, but is much harder to find? You can always pick up an example of the more abundant commodity later for a lessor price.

While the Saints may have had guard at a high priority, the combination of the abundance of guards available and the overall lack of demand across the rest of the league gave them the opportunity to get what they needed at a far lower risk.