Oh, ok. Personally I think Neymar would cost more, because you have to buy his image rights.
Then you have to consider that Santos pay him a salary of around $8m, which is a low estimate. In Europe he could double that with sponsorships. You'd get money back on him for sure, but the initial outlay would be way more than Giovinco + €20m.
There might be some true in what you are saying, but we'd have to consider the weight of Juventus No.10 jersey. Neymar is great in SA, but nobody in Europe yet. Zidane (which Neymar will never be as a player) didn't get the chance to wear our No.10...
If we are successful (which we are already) and he fits in our system we would be semifinalists in CL more often than not imho. Money won't be the issue. 40-45m euros upfront, 7m EUR per year and 40-50% of his image rights sporting Juve's 10 shirt - any sane manager would agree to that. We might bargain for a lower basic salary too...
Giovinco I thought he is valued at 20-25m euros??
PS: About Neymar's value of 50+ I consider most of you dead wrong. Lucas was the case of the oil fever. Inter were close to him, but at a completely different price. 50mil euros will give you FALCAO - he might be a tad older, but he is proven in Europe and Neymar carries higher risk and longer adaptation period. Say someone buys him, but he likes the life in Europe a-la Ronaldinho? Or he can't settle in the area?