Vergne to stay? I kinda rate him, would be interested to see what he could do with a good car as I thought he was pretty evenly matched with Ricciardo. Would probably be good to keep him as a safe pair of hands and to see how Verstappen matches against him.
Before anyone say anything about pay-drivers, he is actually not a bad driver. It's hard to show your potential in such a rubbish car as the Caterham has been.
But yes, the rumors say he brings in around 150 million swedish crowns (15 million of your English pounds) and a team like Sauber needs to pay their bills.
To be fair to him, despite looking so shit until recently, the last 2 or 3 races he really upped his game and started beating the other Caterham and Marussias, since the team changed the brake-by-wire/harvesting to his preference.