Well, no, I don't think anyone could say that was your point, since you described how you've bought several different kinds and how well they "work".
One would think that if that were your point, you would simply have said what I ended up saying: save your money and don't buy the balls, just try washing with water alone.
What's the harm in buying the things? you may ask. Well, let's skip the ethical issue of paying money to (thus encouraging) companies who lie, misinform and defraud people, and go right to the non-subjective:
All these balls have to be *made* somewhere, out of something. That takes resources. They all seem to be made of plastic, in fact, which takes non-renewable resources. Plastic has to be produced and molded somewhere, thus not only taking up resources but creating wastes and emissions, many of which are hazardous. This presents not only an environmental issue but a human-rights one, since the workers in plastic plants are typically low-paid and usually not adequately informed about the risks of working with the plastics.
Then the balls have to be packaged. More resources, more waste, more low-paid workers. Then they have to be shipped all over the country.
We might also take a peek at the fact that these balls cost from $30 to $60, and there are families who can't afford to feed their children (some of whom are sometimes here at MDC).
So, in fact, your (that's a general your) choice to buy something useless that you know is useless *does* affect a whole bunch of other people. As al our choices do in one way or another.
Only in one of the wealthiest, privileged, most over-stuffed nations in the world could someone justify buying an expensive placebo they know is a placebo.