Yes trance and Hardstyle is fast but they use real woofers at the club. Where BA Drivers do work well is in the mids and highs and many BA drivers will be needed to give a clearer and more detailed sound. There is a compromise there are some companies that have BA Drivers for the mids and highs and a Dynamic Driver for the BASS!
If you ever listened to a genre like trance, you would realize that speed is actually needed so maybe you should stop trying to portray a point that is false. Furthermore, it isn't a marketing scheme. More balanced armatures is not necessarily better a distinct difference from your "more does not mean better." You are completely wrong, the usage of more balanced armatures distributes the burden of taking care of the entire spectrum allowing each to specialize in a certain area allowing for a more detailed and in the end result if done properly (key) a better sounding in ear monitor overall.
You are completely wrong, "anyone knows that a well tuned3-4 drivers can easily be on par if not better." Again, if done properly a multitude of drivers allows for greater potential of a better sounding ear phone. The reason this isn't always true is execution, difference in sound signatures by different companies, and as you get deeper into audiophilia the concept of diminishing marginal returns applies so the differences aren't always as distinctly discernible. At least, not by someone as ignorant as you.