For me, if I am hiring a coach for a transfer of 25 passengers between a railway station and hotel, I would ask for a 33 seater. However if I asked for a vehicle with a toilet(higher specification) and the only vehicle they had with one was a 49 seater, I would accept that I would have to pay more.
Likewise, unfair as it may seem to the passenger, if I needed a wheelchair ramp/lift and this was only available in 8 seaters, that's what I would expect to pay for.
Likewise, unfair as it may seem to the passenger, if I needed a wheelchair ramp/lift and this was only available in 8 seaters, that's what I would expect to pay for.