Well thats ccertainly a truism. What do you think about the reverse though?
IMHO i think variation is the key, along with the event. I dont think just having a diet of techno is the answer and hasnt been for years. Different genres of music at the same event makes things much nicer, House, Techno and DnB in one event? Wicked.
After all you dont see events with different bands on all playing EXACTLY the same genre of music in their sets do you? Rock, Thrash, EMO, Ska, Ballad.