When the marker on the location you are looking for appears, there should be an option to move the marker. Now you can let people move it to the correct position, but do not make it permanent until you have reviewed it. This would help cut back on confusion. I visited a house today and every map on the internet was wrong, and my GPS was wrong. House numbers correlate with street numbers. With so many different buildings and houses having the public help might not be such a bad idea.