Where did you read I said it was cheap? Or do you want to check the list of big transfers to England to see the amount of players who in theory aren't worth that money?I don't get your point, in theory none of that make the transfers cheap and when you look at the fee of transfers in general, even in the PL these players weren't cheap. We need to be honest and not go into that nonsense, these are in hindsight bad transfers because the players weren't worth that amount of money but they weren't cheap at all.
If clubs are paying its because they think it is, the problem is always the same. For some its quality with others it can be the management, others who don't adapt etc. And United clearly is one of the clubs who other clubs demand more money. Be it clubs from England or abroad. Sometimes money don't make you happy at all.