I tend to be in the "familiarity breeds contempt" camp. As a former real estate professional, I could not emphasize more strongly to clients not to fall in love with their property. I seldom succeeded in doing so, which through time, prompted me to work only on deals that were priced with some resemblance to reality.
Part of this psychology might be reflected in the old joke that "you can mess with my wife and drink my liquor, but never badmouth my home course", which, I guess, speaks to how people value and prioritize things. Don't know why, but I find that superintendents and architects are among the most resistant professionals to criticism and suggestions.