I don't think it'll ever take off for two reasons : indeed it's obvious that the price is horrendous, but also wood is a heat insulator, and that does not work well with today's CPUs that can fry eggs.
As for using a 14-year-old PC, well I don't think anyone in their right mind would actually like to wait four minutes on boot, then watch their mouse trundle ponderously across the screen every time they move it. Come on, we upgrade our PCs because we want everything to happen in the blink of an eye.
Speed and power, we never have enough of it. If you think about it, 60hp for a car is quite enough for the use most people get out of them. Do you want a 60hp car ? Of course not ! You want the most powerful engine you can afford - it's more comfortable.
Well in PCs it's the same - and it's a lot more affordable than a car.
Which is why this infernal upgrade cycle will only end when the most basic model can do more than anyone can personally expect to use. Like stereo sound at 44Mhz. We had that for the longest time because it was good enough. This, of course, did not please the makers of sound equipment, and they invented Surround Sound to make us all upgrade. That path is almost already a dead-end though, because I doubt anyone can make a difference between 5.1 and 7.1 sound setups. We won't be getting a 12.2 either. For PCs, it'll be the same. There's a barrier of use somewhere, whether it is at 4 cores or 400 does not matter. When we get there, people will no longer need to upgrade, and that will be that.
In the meantime, of course, some companies are making fortunes. That's commerce for you !
Pascal.
I've got nothing to hide, and I'd very much like to keep that away from prying eyes.