Should I have this camera spruced up before I sell it?

I bought a Leica iif for $5 today. It is a tiny bit grimy. Otherwise it is in great condition. The camera is probably worth $200 just like it is, bare minimum. If I get it fixed up, it is likely worth $500 maximum. I am sure any reputable camera person would charge me at least $100. Should I just make my buck and move on, or wait and try to invest some money to make a bit more…