"Dollars spent do not disappear" is true but meaningless. What counts is the wealth people create, and the opportunity cost of what you do.

For an extreme example, imagine that every day I hire somebody to move my wood pile to the other side of the house. After two days I'm back where I started, but I've wasted a person's labor for two days. The dollars I paid them didn't disappear, but we've lost whatever useful activity they might have done during that time.

Not all work brings value to society. Just because someone is given money to do something doesn't make that something useful. On the other hand, just because something isn't of value to society doesn't mean it should be prohibited or taxed out of existence. And determining whether something is useful to society is really tough, so we shouldn't assume we can figure it out. But saying they "create thousands of jobs" and "dollars spent do not disappear" isn't a good argument for these things.