If you start with the assumption that limited short trips are normal, and that no additional maintenance should be required because of this use pattern, fine. Forget the freezing for a moment. Pretend it is always summer. What you are saying is that driving around with all that moisture in your engine and oil is fine and not detrimental. Many would disagree with that position.

I think it is probably best that you sell it. I think we discussed that in this thread some time back, IIRC

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2007 X3 3.0si, 6 MT, Premium, White

Retired:
2008 535i, 6 MT, M Sport, Premium, Space Grey
2003 X5 3.0 Steptronic, Premium, Titanium Silver
2002 325xi 5 MT, Steel Grey
2004 Z4 3.0 Premium, Sport, SMG, Maldives Blue