I suggest you to continue earning MRP until you have a considerable amount to exchange them or buy something useful like TCredits or even a S-Builder share.
For example, you can buy a 50 Pack of TCredits for 4700 MRP. It can be very useful if you are in the middle of a Pricebenders auction and run out of TCredits, You can quickly purchase more TCredits to continue in the auction.
