That is actually a good point, what happens is that many streets does not have any address points, and your search puts the marker on an arbitrary end of the st

That is actually a good point, what happens is that many streets does not have any address points, and your search puts the marker on an arbitrary end of the street, so a mile off sounds about right. Address points are really cumbersome to crowd source, you really need either open data or buy a geocoder. Not easy to do if need to allow everyone to download the data and do what ever they want with it.