The smart and I are headed to warmer climes, hence the need to sell the cold-climate tires. The rubber compound is much better below 45ºF. I don't know if I'll see 45ºF in the next year.
Even if I had financial issues that might make me want to sell the smart, I customized it enough up front that I'm sure I'm still upside down on the loan. I hope to be with this car a very long time.