Is right.
McCarthy is not worth THREE times as much as Diame, or 60% more than Capoue, or 40% more than Medel, or as much as Dembele. £15m is an absurd price and I applaud Dave Whelan for sticking to his guns - he's showing Kenwright how you deal with an unwanted interest in one of your players.
£15m on one transfer is only warranted if the player concerned is going to have a BIG impact on your first XI; if he won't, then it should be put towards two or more decent squad players, and we all know we need more strength in depth.
That £15m could pay the transfer fee for Diame (£5.5m allegedly) and the loan fees for the likes of Moses and Lukaku (or Ba), possibly covering the wages for all three for a year too.
Diame + Moses + Ba/Lukaku + their wages for a year is a VASTLY better deal than £15m for McCarthy on his own.