clubs could have one installed in their booth and DJs could come and hook up their laptop to it and not have to worry about jacking into the mixer and wires and such...
Dude... the DJ then has to install drivers on his laptop. That doesn't ness work either. I wouldn't want to install drivers that I haven't tested before going live. That's moronic.
since the 800 is a higher model shouldn't it be more expensive?
No. Not always. Besides, these DO things the 800 only dreams of.