relax people, it's a supply and demand thing with hard-balling mingled in between
Napoli and Udinese seemed to have struck a deal for Inler for 12 or so mil + other half of Denis. Once Juve and some other teams showed interest and Inler basically blocked the Napoli deal, if he is to move now, a new deal would have to be reached with Juve and it's normal that the asking price is higher, considering the rivaling bids and the increased interest in the player.
With Inler wanting Juve, if Juve are really decided on him and are ready to be persistent enough in getting him, eventually they will find a solution that would bring the player to Torino at a price acceptable for both parties ... relax, once Inler has set his mind on moving to Juve, there isn't much Udinese can do but play hard ball and try to get the most out of the deal, knowing very well they are gonna lose him.