I would ASSume (LOL) he's talking about charging 1000 per seat.
if you're using Hoosier, you're going to go through a set of fronts every 2.37 hours, 150 per tire x 6, plus mounting, hoping the rears go the whole way is $1000, I'd imagine, and just gas at $3.50 a gallon (if going cheap unleaded)
at an average speed of 75, (x 8 hrs), means 600 miles, /10MPG= 60 gallons, or a bit over $210, plus a set of pads ($100), an oil change ($40) so, right there you're up to an easy $1350, and that's not including hubs discs and the like (because I have no clue how much they cost$).
All up though it's an easy couple grand without thinking very hard.