It's a little different up here tbh. Look hre goes, the last I seen the very best price we've seen is around £1,200 for a 49 seater. That's IF we could get any which was unlikely. That works out at about £25 per seat presuming you don't do kids prices where you'd obviously have to raise the adult price. Would people be happy to pay £75 for an adult and 2 kids? Not to mention the further planning, organisation, taking of bookings, finding conveners for each bus etc. All done by a few folk for free on top of their jobs, familys and other commitments.
The train still has plenty space left and offers great value too it would be £50 for an adult and 2 kids.