Agree.
I think products have to work at least a little bit if they are to stay in business. Some less than others but its about giving the plant what it needs.
Some people love it, and bonsai masters I work with swear by it, but I think Superthrive is a questionable product, or any B-Vitamin supplement for plants. I have read papers from educated botanists stating that there is absolutely zero evidence of B-vitamins being usable to plants. But I'm on the fence. I have used Superthrive with no noticeable effects. My plants were always just as healthy without it.