And woodlands can give you this wonderful glow of "green virtue": yes, I may have a private jet - but I also have this bit of woodlands, so my carbon footprint is ok, isn't it?
(Sorry for being so cynical, and I'm sure this is not the reason why most people buy a bit of woodland... I know a cousin of mine has had one for ages, simply because they liked the idea of owning a piece of nature. That was long before it became fashionable, or even a sensible bit of investment.)