I dunno, how accurate is your pin? My pin is about 3-4 miles from my actual location, so not that accurate.
Also, this is information that is already being gathered by many other sites as you travel around the Internet.
In fairness, I'll tell you what I'll do. I'll do some programming today and replace the Maps with an updated version. It will allow folks to opt in / opt out if they are concerned about privacy, and so that way you have control over it.
As I said though, anyone on the Internet pretty much can be triangulated in a general sense based on their IP address, WiFi network SSID (if picked up by Google Maps roving cars), or cell tower location (if using a mobile device).