Only thing I get is the risk of the big price (rest of alot of rubbish of peeps who barely watched him, yes that means you in particular Hustini), but who said the price will be that hefty? What media exaggerates or clubs demand well in advance to hype their merchandize so to speak, and what they will cost is totally different things. If I believed these inflated prices to be fact, I would be quite reluctant too (and had never seen what kind of huge talent he is too, even more), but there is such a thing called bargaining (and this player is desperate to leave, hence lowers the price).
Only real tangible issue I have is its one of the other, Dzeko or Neymar, and regardless of how amazing I think Neymar will be, Dzeko is the safer choice. Just wish it was possible to somehow get both.