Other than the tuneing machines, your MD really doesn't look too bad from the photos. You can do the obvious things needing fixing yourself, new strings [normal maintenance], replacing tuneing machines is pretty easy although selecting new ones is a bit harder. Just pull and replace the end pins, they're probably escutcheon nails or brads. Don't worry about the scratches/chips, it's part of having a used, probably older, instrument. I heard a pro country singer used an older guitar that actually had holes worn through the top. Don't use anything with silicone in it to clean the outside since it cannot be removed, it will prevent any refinishing or other repair work to the wood.
Bottom line, don't pay for anything more than tuneing machine installation at most.