Because Tiesto makes shitty music. He is one of the most overrated DJ and producer ever.
His songs sound exactly the same with unnervingly long breakdowns to go to NOTHING.
He never innovates, he just uses the same template in each of his tracks.
Besides, he doesn't mix with heart. He puts up a plate, goes behind in the vip, makes a line of coke and comes back to drop another record with a s**t transition.
And he charges WAY too much for what he's worth. He's a money whore.
oh and here:
http://www.ishkur.com/articles/trancecracker.php