I've never really paid to go see a DJ play, so its not that big of a deal for me. I did, however, pay $50 on a whim one night to go see Sasha perform and all he did was sit behind his iMac / Ableton Live setup mixing 7-minute tunes for a few hours. Then again the sound was fucking amazing, the lights were dope and the floor was completely packed... I'm not really even one for trance, but I still enjoyed myself entirely.