In fact, I was on an HGTV show with Celebrity Apprentice winner Kendra Todd called called My House is Worth What, whose premise was we'd go assess how much value a homeowner's recent renovations was added to the property. Back in the hey-day, you could buy a busted up shack and it'd appreciate 20%! Then the market tanked. With property values plummeting, ummm, that show wasn't as happy anymore, so it went bye-bye.
Regardless, it is still important to find out the correct value of your house. Ignorance is NOT bliss! Watch my quick tips on eHow on How to Find What Your House Will Appraise For.