Agree 100%. How many times have we thought "ah they'll come around towards the end of the window" and then we're left with nothing. Jeff (or whoever) has been burnt so many times trying to play hardball that you'd have thought he'd learnt his lesson by now.
Seems easy for me to say "pay the extra £5m", as it's not my money. But surely if we've scouted these players and believe their value will increase over time, £5m is neither here nor there, really. Obviously if the valuations are, I'd say £10m+ away from each other, it's probably time to move on to other targets.