The only issue with MRP comes when a buyer dosent accept the package or misses the delivery. The package is returned, and the seller has to pay the shipping/re-stock. Lots of on line parts sellers have failed because of this, and then they bitch about MRP.
Hell even Racing Planet may be a ploy , and really selling MRP> Who knows... I just have to fill the paper work, and email it back. With drop shipping I may be able to help save some money for everyone. The other shops I have to pay double shipping, and it cuts into the savings.