Pricing on parts kits does not update along with the price file. The system automatically assigns a "price used" based on current PC retail and this always stays as the selling price. I would suggest that all prices should update along with the price file unless the price used has been entered manually.
Parts kits allow us to quickly create quotes for or bill out commonly used groups of parts. If the pricing for these parts does not adjust automatically we will quickly be over or undercharging for our parts. Knowing that parts kit pricing is accurate allows us to encourage the use of kits which greatly speeds up productivity on the parts counter.