well, the question was more " why do" but fair enough.
One issue I have (and i'm saying this as a leaning libertarian) with it is that the quality of the music, as you aptly pointed out, is completely financially/market driven. And i'm actually of the opinion that this, especially in the long run, doesn't create " new great music" but leads to precisely the shitty mediocrity problem we've seen with trance over the last couple of years namely:
- attempts at being " cool" by sailing along every trend (kids like hard? -> hardstlye, kids like electro? -> fartbasses, kids like house? -> trouse etc.)
- dogmatic formulaic templates driven by whatever is the then most popular vengeance sample.
- copy catting galore, see for further details the: shocking stuff that once destroyed our scene, thread,
financially its beneficial i grant you, but artistically? there's a very good reason why near everbody on this forum complaints the likes of Tijs and Armin " sold out" and that those financial incentives it didn't particularly elevate the quality of their music.