Not necessarily. When much larger sums of money are involved the controls, checks and balances etc need to be greater.
Disagree.
This is tax payers money regardless of the amount. It is a question of principle and every contract and expense should be justified. The size of the sums are irrelevant.
As you said earlier, it is a question of paying a fair rate.
I doubt you go to the pub and happily pay £10 for one pint of beer but then question the cost when you are buy a round for six of your mates.