The problem for the majority, unlike real estate, markets continually morph in speed, direction and themes.
So it is difficult to handle, a bit like changing girlfiends every year, they all have different moods and tastes and knowing them takes time, or you have to be very astute at gauging them.
For an investor or trader being able to cope with constant change is key.
So this is the problem with indicator tools as well as investment advisors, if they are not adaptable, (like a moving average) they are lagging, always a little too late participants at the latest fashion parade.
So the point I'm making, investing for income is a moving target, the prize being there one moment, then gone, so this forces one to keep moving their sights.