Not so much the first couple things, but the idea of rust on the dipstick would concern me. It's easy to have oil looking clear if it was changed and then stored for the winter. Running it for a while and inspecting the filter later could be enlightening, but if there are real questions about the engine, it's hard to justify the price.
That's my opinion, I could be wrong.
I spent most of my money on booze, broads and boats. The rest I wasted. - Elmore Leonard