Think about it this way. Suppose someone needs to source a 5 gal pail, order it, or drive around town trying to find one. Then make a trip to Lowes buy the cpvc pipe, the fittings and glue. Go home and put it all together using tools you may or may not have, before being able to use it. Even if you only make $50 a hour washing and spend an hour on the pail project plus $10 on materials you've spent $60 instead of $40.
For me, I could make one in 10 minutes because I already have a shop with all the tools and supplies except probably the barb/elbow. But for some people it's easier to just make a phone call and be done with it.
Either way you look at it, as long as it gets done and you keep washing is the main thing. $40 would have saved the OP money in wasted chemical and now he has a negative online review because of dumping his bucket and burning grass. That one bad review could possibly cost him hundreds if not thousands in future revenue. Looking at it that way $40 is pretty cheap.