You could, but these things have potential value because they save time.
Anyone can sit at a screen and pick stocks all day, and I'd guess most of people of average intelligence would do better than the markets given a few simple strategies - because most brokers seem happy to make more money from fees than from investment gains.
But not many people want to do this. If you start selling a maintenance-free money machine, it's not going to be hard to get sales.
Of course if enough people start using it, it stops working. But that's a different problem.
Anyone can sit at a screen and pick stocks all day, and I'd guess most of people of average intelligence would do better than the markets given a few simple strategies - because most brokers seem happy to make more money from fees than from investment gains.
But not many people want to do this. If you start selling a maintenance-free money machine, it's not going to be hard to get sales.
Of course if enough people start using it, it stops working. But that's a different problem.