I think you're being a little harsh, actually. There was lots of talk from Capello about how his move to Villa improved Bent, but actually his only discernible improvement was his work rate. When he first arrived, for example, and we played City, he spent the entire match hassling and running for the ball. He's no slouch anymore. Sure, he's not Rooney, but still.
The only sticking point is indeed the price. We'll be looking for lots, since we have him on a long-termer and want to keep him. If he wants to go - and it's likely he would - the price may come down a little, but again it's supply and demand. The demand for proven, experienced Premier League goalscorers who more or less guarantee you double figures is sky high, and the realistic supply is basically just Bent.