I don't think it's preposterous at all... I'm set to close on the sale of my house a week from tomorrow and I'm going to lose about as much as you on the deal. I built this house. It's special to me, and it was never part of the plan to sell it for less than what it cost to buy land / build. Part of letting it go for less than I think I can get really hurts, and not just from a monetary standpoint but from an emotional one. I'm sure I could wait around, paying my mortgage, and get a better offer someday... but how long will I have to wait? What if the economy crashes again while I'm waiting for my extra 50k? What is the value of waiting 6 months, a year... the cost of the mental strain of sitting around wondering if maybe it'll be three years, five or maybe never get an offer this high again?
No. I have things I want to go do, and while this house is fantastic and we have enjoyed it tremendously, it isn't the direction we want to go anymore. Once we accepted that as a fact, "this isn't what I want to do anymore", it just became a question of what we were going to do to put ourselves on the track we wanted to be on for the next part of our lives. On to the next thing, which I fully expect to be not exactly what I want 10 years from now. I'm fine with that, I'll solve future problems as they arise. Good luck to you.