No, seriously, it's saving me money. The return is so clear that if you want to do the same thing, you'll have banks lining up to loan you the money because you can pay them back with the savings and still have money left.
The facts are simple enough- The solar array will pay for itself in 9 years. The warranty on the equipment is 30 years. That's 21 years of free electricity.
The two cars cost $40K for both. My neighbor spent more than that for one car that burns $5/gallon gas.
I agree that one person can't change the world, but the people who actually try stand a better chance of changing the world than those who sit on the sidelines and scoff.