That's a useless stat. Spurs have an expensive squad as their big players have been bought for big money, carrick/bervatov/keane/, which they then spent.
Why's it useless and where have I said different about why Spurs' squad is so expensive? Although Redknapp can't take credit for Spurs making big money from Berbatov etc as he wasn't at Spurs then.
How else can you judge a managers performance other than looking at their success in comparison to the resources (playing squad) they have? If it was just about success then the manager of the year would be the manager of the Champions.
Like I initially said, I'm not taking anything away from Redknapp or Spurs because it is an achievement because they've not managed it before, if nothing else but considering the squad they've got they should be expected to challenge for the CL spots at the very least.