In LA the economic value of a tree is overall negative - as the fast growing trees planted long ago have become too large and destroyed miles of sidewalks
http://www.nbclosangeles.com/news/local/LA-Expected-to-OK-Pl...
"$1.4 billion plan to repair a backlog of broken sidewalks that will allow the city to turn over the responsibility of future upkeep to property owners. City officials plan to spend the funds, which will average at least $30 million a year over the next three decades"
0.1% of LA county's budget next year will be repairing damage from trees.
I'm not going to argue whether that's a large or a small amount. Just want to put the $1.4B number into perspective.