Falcao cost 4.5 million. And Deco didn't cost 8 million - not even 800k: he was released by Benfica and was playing in a very small Portuguese club.
Porto is the best managed sports club in the world. Their ordinary revenues - gates, tv deal, sponsorships - are at the level of Swansea or Sporting Gijon. Yet they always have great teams, amongst the best in Europe, thanks to the ability of finding grossly underpriced talent. Been doing this since the 80s: Futre, Madjer, Rui Barros were the first he sold by millions after acquiring them for basically nothing. Pinto da Costa is a genius, the Pelé of sports management.
Next in the pipeline:
Alvaro Pereira - 4m
James Rodriguez - 4.5m
Rolando - 0.5m
Hulk - 5m from the Japanese II division
Moutinho - 10m
Kleber - free transfer
Guarin - 1.5m
Some intriguing prospects for the next generation too: Iturbe, Defour, Mangala, Danilo, Alex Sandro, Souza, Sérgio Oliveira.