I'd buy the car if it is good shape, regardless if I plan to use it for Uber or not. See, when I used to drive Bradley's and Abrams in the Army they took a lot of gas. Now, when i got back from duty I would get in my car and realize that my V-8 Camaro (the car I owned at that time) didn't use nearly 1/8th the gas those BFV or Abram did. Then a light turned on, and blew out, in my head. I realized that I could stop complaining about my gas guzzler V-8 if I bought a gas sipping 4 banger. A week later for the small price of $500 I had a 1980s something Chevy Cavalier that was missing the front bumper and was amazingly painted different colors on two doors. OHHHHHH the money I saved on gas back then, and it was like $1/gal or so.
Moral of the story, never pass up a good deal when you can....