If the final product is useful to him, then the cost is justified.
If it would not be useful to you then you are right, it would not be worth it to you
ImA4Wheelr knows me all too well. He zeroed in on that topic when he posted this:
He realizes that this build will cost me nothing other than the price of the DPS5015. The case is from an old battery charger and the power source, the yard tool battery, I already had and have other uses for it.
He knows that with all the stuff I am constantly buying, for example, Home Depot Deal Alerts & Discussion Thread I really gotta watch my spending. 