In my case my system with saws and ancillary equipment paid for itself in about 2 years. Where can you get a risk free 50% return on an investment. I chose wood mainly because you are in control of much more than just money. It also serves as a hedge against adverse events like power outages, hyperinflation etc. I am performing productive exercise in scrounging. Any stress can be channelled into splitting wood. I can set the temperature to what is comfortable and not fret about it and have the entertainment value of viewing the fire (OK I am a pyro). It also can serve as a teaching tool to establish a work ethic.