I think this is a fair point. £12M without any conditions would be very risky, but a £5M fee upfront with a further £7M based on appearances, although expensive for a 16 year old, wouldn't be anything like as painful if he failed to live up to his potential. I doubt whether his wages would be sky-high either. That's about the upper-limit though I'd say. If Chelsea/Arsenal start to talk about £8M up front/a further £12M on appearances then forget it.