He won't get them 12 points over a season, but even if he gives them 3 or 4, who's to say that isn't the difference between CL football and no CL football? Or automatic CL qualification or even a close title race? Talk about whether Cech will win anything for Arsenal is pretty pointless if you're looking forward.
But most people agree that Arsenal have just spent about 11 mil on a player that will improve their squad and win them some points over the next few seasons. Rare to be able to say that about a player going to a top club. I mean, that's what Fulham paid for a now 28 year old McCormack in the Championship to put the fee in perspective.
Really good buy and any talk of resale value can get stuffed.