How much are you suggesting Fabregas should go for?
Real paid Utd a huge fee for a number of reasons; firstly they're Real and are more than happy to pay crazy fees, Ronaldo was 1 of the 2 best players in the world and he'd massively improve Real as a side. Ronaldo was worth £80m to Real.
Ibrahimovic aside Barca tend not to pay big fees on players, while Fabregas is an excellent player he's not 1 of the top few players in the world nor would he massively improve Barca. Fabregas isn't worth a huge fee to Barca.
You can knock Barca as much as you like for the comments in the press but it's all meaningless. The only thing that matters and the only reason why there is any speculation is because Fabregas wants to leave.
But he is worth that huge fee to Arsenal. Surely that is the important part of this? Barcelona want him, so they pay what Arsenal deem reasonable.
It's not like they are asking for Ronaldo type fees, I think the rumoured £35-40m is reasonable for him.