davidc18 -- did you get quotes from CarMax and Tesla and, if so, would you mind disclosing the three offers? I think it would be very useful for both potential buyers and sellers on this forum.
And, having sold several cars to CarMax and several to private parties (all ICE), I agree that the ease of sale to CarMax is huge in comparison to a private party -- and worth taking a lower number. I'll note, however, that deals with established members of car forums tend to go smoother than general public deals.