That's because these trees are very much a crop. Even before they were planted, the forestry company is having the seedlings raised, in order to harvest them a hundred or so years from now. That's a long time to wait. But if foresters just left a logged area to fend for itself, it could take up to 300 years to come back on its own. The role of the tree nursery is to help make sure foresters have as much wood growing in our forests as possible.
Trees are nice to look at.
Their value is different for every one of us.