Property taxes go down depending upon the area. Your homes in your little area may be priced high, but if you reach beyond that and examine the other 'hoods in that same zip code, I wonder what you'll find.
Furthermore, what's the school cluster? I can think of Woodside in SS - and how pricey those homes are in comparison to other subdivision in SS. But look at the school cluster that's part of the DCC. There are problems with perceptions. So when a potential buyer sees DCC, s/he may run in the other direction.
We have friends who purchased a house in a solid area (or so we thought). They bought during the height - probably close to $700K for a 4 BR colonial. Over the past 9 years, their property values plummeted. Their home is now assessed at $300K below what they paid for.
So your pocket may be lovely, but it's still affected by the entire area around it.
If you're in MD, do a search -
http://sdat.resiusa.org/RealProperty/Pages/default.aspx