I've said it before, regularly dosing bacteria to an established tank is separating a fool from their money.
Does that stop people from dosing it? Of course not, is there a level of the placebo effect? Maybe. I think we're on the frontier of trying to understand bacteria and how to manipulate it to our tanks advantage. We are far from that point, but it doesn’t stop companies from taking advantage of that unknown to market.
Most of us has fallen victim to these tactics and at least gave bacteria a try. Is the lack of change enough to say, it's a sham? Is a tank in the upward swing able to take credit for the dosing of bacteria?
Whether or not bacteria is the key to making reefing easier, I don't think we are going to be able to get it from a bottle that sits on a shelf and contains a handful of strans of bacteria.
If we were to benefit from adding bacteria, it would need to be from the type that can multiply in our tanks when added.