Land is a little different from shares because you can meaningful affect the value of your land by spending your life improving your community if everyone else does too. You can be a good neighbour much more easily than a good shareholder.

I picked up some rubbish from the street on my way home yesterday. That act probably raised all our property values by some microscopic fraction of a cent. Then global macroeconomic conditions affected the property value by a huge amount more. It would be incorrect to attribute any gains to picking up rubbish, but it would be a very understandable human mistake, I think.