The chance of increase shirt sales and marketing advantages if Juve bought Jovetic is high especially if he performed well in Juve shirt.
However, what I'm afraid if Juve bought Jovetic is that because of the literary similarities between Jovetic and Juventus, ppl will be too subjective and put Jovetic as the face of Juve/the next Del Piero, overshadowing the current Juve best players such as Buffon, Pirlo, Chiellini, Marchisio and Vidal. While in term of contribution to the team, he might not be better than those players.
Become a golden boy of Juve because of the similarities of the name might also increase the chance of envious from other Juve players because they will feel less appreciated by the fans/crowd compared to Jovetic. the worst case is if he is treated as Messi in Barca who I believe Messi feels he is already bigger than Barca itself
And of course because of his history of injuries and the price tag which obviously wont come cheap (probably around 20+ till 30ish)
Juve better spent the cash to purchase other not overrated player(s)
My wishlist for next season: Full ownership of Boakye and ?Sorensen? , Pirlo tutoring Marrone and Pogba to be his apprentice and retired after WC2014 (to make sure Pogba and Marrone will happily stay in Juve as there's more space and chance to play in the midfield of Juve)