It can carry 15 passengers or 1800 Kg cargo and is extremely durable and cheap to run and repair, therefore is incredibly cheap on a cost per unit basis.
Also low initial investment for entrepreneurs anyway who want to offer mini-bus or transport services
It uses parts from vehicles that were on the market for decades now, so their reliability is well known. The Ford Transit engine is not going to get less reliable because they put it in a different frame.
