I‘d have to get my tables from work. It highly depends on the species, soil, size, location, age, natural area of the species and so forth. A decently sized oak at around 100-150 years old usually gets weighed in at around 2000€. Variation however is a given.
Trees prevent soil erosion, keep water clean, provide the basis for many beneficial insects and so forth and so on. They have a giant value in our financial system.
All of these views are valid. A tree has to be seen for what it can provide. If it’s more valuable to society and nature as a tree, leave it be. If other trees can gain from it being removed earlier than its natural decay demands, I’d argue to remove it.
So far, „sky“ is pretty nice