Its not the cash so much its the age he is in relation to what he would cost. And Bale would be at the club for years and have a big sale value and would bring so much cash to the club also. I don't mind paying top dollar but you have to take other things into consideration.
You take a risk either way bale could come in and get injured for 10 months, who knows. Godin might stay fit for 3 years and if that happened he'd be worth the 30m it's a risk you have to take.
For me the age thing is nonsense, i blame the fifa and fm generation.