They are. But they're also not desperate nor are they the richest club on the planet.
When you're loaded with £ and in desperate need of signings, any potential seller will always ramp up the price.
I think with Wood though, you know what you're getting. Diaz from Blackburn might be out of his depth being chucked into a top flight relegation fight, then again he might not.
Signing Diaz doesn't weaken a relegation rival either, Wood does.