What logic is this? Small sum of money buys larger sum money?

Context:

in Gateshead, is one of the 'city academies' set up in a proud
initiative of the Blair government. Rich benefactors are encouraged
to put up a relatively small sum of money (￡2 million in the case of
Emmanuel), which buys a much larger sum of government money
( ￡20 million for the school, plus running costs and salaries in
perpetuity), and also buys the benefactor the right to control the ethos
of the school, the appointment of a majority of the school gover-
nors, the policy for exclusion or inclusion of pupils, and much else.
Emmanuel's 10 per cent benefactor is Sir Peter Vardy, a wealthy
car "salesman with a creditable desire to give today's children the
education he wishes he had had, and a less creditable desire to
imprint his personal religious convictions upon them.* Vardy has

More:
Dawkins: The God Delusion