It's probably due to the fact that they have a built a reputation on selling players that go on to do well (most of the time) for a high price so they thus they can uphold their high price and ability to say no to lower prices
If I had to take one player from Porto, it would be Mangala. Strong, aggressive, rapid, good in the air and only 22 years old. After a couple years of hanging out with Chiellini and Barzagli, the guy would be like a brick wall.
Partly, I agree, but on the other hand, once he was back, he gave it his all. Compared to Mbokani and Jova, Biglia was definately the most motivated.
And he did score (ok, with some luck) the goal that brought us the title.
Also, I agree it might work, he is made for SerieA.