Here the problem:
IF everyone committed/or was required to buying tyres from supplier X, a control tyre, from a control supplier, said supplier could offer a better deal.
BUT as everyone, has a preffered supplier/sponsor/mate who they want to get tyres from it cant/wont happen.
Holbeach are offering a service just like everyone else, use them if you want, or use your own supplier, it is a free market. You don't see
www.cheapandeasytyres.co.uk at the racetrack though.