i just wanna mention that it is much easier to get players that have a good impact,when the team has a much lower quality standard.
what impact would those players have had in juve ?
gila would have found very few space,
vargas would not have found space as left back, because he seems to be suspicious on that part (that is probably the reason he plays lm or left wing for the viola)
comotto is really weaker than mellberg and would not stand a chance against legro
taking off my fan glasses i would say it is perhaps en par with jovetic and giovinco ... did not see enough from jovetic that really did count (assist or goal)
melo, this guy i sadly can not say much about ... i dont know if he had seen any first team appearances when zanetti and sissoko was fit.
fact is fiorentinas quality standards was way lower than ours, so it was easier to find someone that would improve that
I don't remember when was the last time a serie A team had such minus.
Last summer we bought players for ~38m eur but we also sold players (+loans +co-ownerships) for 25m eur so we had a minus of ~13m eur only.
Even on our serie B comeback when we were forced to splash a lot, we had a minus of ~35m eur. Milan and Inter also can't afford to do what Fiorentina did.
my source says 30.6m € minus, but your point stands ... they made a big minus !
http://www.transfermarkt.de/de/verein/430/ac-florenz/transfers/uebersicht.html