I just think about the hours of labor, the materials which probably were NOT all laying around, the cost of the machine tools, air compressor, painting rig, etc., and I'm forced to conclude that the guy did it because he wanted to and because he could. Engine stands are expensive but they're not THAT expensive. Just the cost of cutting oil and welding rod and primer and paint would have covered the cost of renting the stand.
But that's just it - we hobbyists do things because we want to and because we can. The finances are sometimes painful, but the hours spent doing things are priceless.