Currently, the price match policy will only price match a competitor if that competitor has the product immediately available, which excludes pre-orders from being price matched with other retailers. The policy discourages pre-orders since the only way to price match as stated in the policy is to wait until the release date to order and then price match at the time of purchase/order. Most will just end up pre-ordering with the retailer that is selling the item at the lowest cost.
Price matching isn't "technically" allowed once the item arrives and the competing retailer has the same item immediately available since post-purchase price matching is only allowed if Best Buy drops the price within the return/exchange window. I know that customer service reps will often make exceptions and price match other retailers after purchase, but it's not the "policy" to do so.
What ends up happening in my case with pre-orders is if a competitor offers a lower price and the Best Buy price doesn't drop by the time the item ships, I order it from the other retailer and the item shipped from Best Buy gets returned.
The post-purchase price match policy doesn't make much sense since customers can return a product within the return period, then immediately rebuy it and get a price match (which may be why some CSRs will just do it anyway).
I hear where you are coming from on this. Would anyone else like to see this as a reality? Make sure to vote for an idea if you like it.