Anyone on here is welcome to scream until they're blue in the face that "He's shit" or whatever. It doesn't change anything.
Footballers are not bought or sold based on fans opinions, and the price of transfers absolutely isn't either.
If Vini leaves, we'll sell him for the maximum amount of money we can get a club to offer us. If that happens to be 15/20 million, then folks can laugh at the buying club if they want, but he'll more than likely end up being worth a fair few bob more than any transfer fee we get.