Because Juventus are colossal ****s, they can't pay the refs anymore so instead their new approach is to either buy the best player from the team rivaling them (Pjanic from Roma, Higuain from Napoli) or better yet when you see somebody might compete to take their main target as they're doing to Inter with Lukaku, it's shitty but it's working.
If I was Lukaku I'd be looking at how desperate Conte is to have me on his side and question whether I want to be a bit part player at Juventus or the main man at Inter, I know what I'd personally do because it hasn't gone well for him at United and to see a manager so invested in you as a player would bring huge confidence.
The thing is Inter arent offering what Manure want - otherwise Lukaku would have gone already.
I cant help but think Manure are getting a much better deal than Juve are...