Hell yeah. Get some $1000 bomber karts off CL when they pop up, as rentals.
I would honestly buy my own kart, I have been thinking of that for a while and this would be the excuse to do so!
Have a track rental fee for BYOK, and another price for rental and track time.:thumbup
Even an autocross type layout for karts would suffice. Maybe get fancy with some concrete and make aprons and shit too, paint them up red/white and frame up some simple pressure treated walls where the track layout could potentially intersect if someone looped out.