Transfer fee inflation is partly an issue because clubs let it be . United are paying stupid money, which encourages Palace somewhat, but if clubs stood up for themselves and moved onto the next target when they got quoted a ridiculous price then things would eventually level out. There must be players on the continent that could have a similar impact to Zaha but cost millions less.
Clubs are emboldened by their new found TV money riches and it means they have a bit more leeway in terms of keeping their prized assets because they don't necessarily need the transfer fee and they can afford more in wages, but it doesn't mean they should be bowed to when they set unreasonable levels.
Wan Bissaka's move has anchored people's minds to a certain figure when it comes to the Zaha deal, as Palace are no doubt trying to do with suitors for Zaha. There's a number of reasons that deal should be completely disregarded, but it isn't and the media do a brilliant job of hyping it up so much and ensuring people thing it's a great deal. It is a completely idiotic situation and fans buy in to it far too easily.