Speak for yourself on that one
Of course I am speaking for myself. I'm certainly not speaking for you or the guy next to you.
FPS games are dumb and boring, in my humble 27 years of computer gaming experience. They are for mindless zombies with no concept of grand strategy. They are for grunts and peons. RTS games, on the other hand, are for Generals & Commanders! Leave those fps games to the peasants.
The reason why more people play FPS games is because most people are not natural born commanders, which is required to enjoy RTS games. Most people are grunts by instinct and therefore genetically enjoy the grunt work much better. They simply don't enjoy commanding a multitude of units. They would prefer to run around mindlessly and try to take the objective which has been designated for them. They simply do not enjoy leading and commanding. There will always be more FPS gamers than RTS gamers for this genetic reason. Some of them will mature out of the FPS genre and into the RTS genre as they get older and more experienced with gaming.
I've played (and mastered) plenty of FPS games and they're just stupid. I will not be buying anymore.