Foreign clubs selling to PL teams call the doubling or trebling of expected transfer fees, 'The English Tax'. They know that there's so much money sloshing around that they can make up a stupid figure and some stupid ****er will pay it. It comes from having too much money and no idea what to do with it. Money will corrupt everything, eventually.
A few years ago, when you could make a fortune smuggling in cigarettes from abroad, a couple of blokes I knew from the pub, were at it. They were buying cigarettes in Luxembourg and bringing them back through Belgium, they had distribution sorted in pubs and shops and were making thousands of pounds a day, each. Of course, they couldn't bank it or buy anything large that was legal with it or they would come to the attention of the authorities. One day, I watched them playing pool for £5,000 a frame. It meant nothing to them at all.