Looking it up, it seems most initial Portuguese colonies around the world were made by private investors, explorers, traders, etc. No real cost to the crown. Kind of how most European colonies initially started in Africa and Asia. When it came to Brazil the crown eventually got involved, but it seems that it was because they wanted to monopolize the brazilwood trade, as it could be used to make dyes. We should remember what the Dutch or Portuguese did in the Soice Islands, one of them destroying all the trees on other islands in order to monopolize the trade of a certain spice. It seems the slave trade was a big thing for the Portuguese before getting Brazil, but we should still think on how this effects prices. The South Sea Bubble in Great Britain came along because at one point the English got a monopoly on trading slaves to the Spanish colonies, somthere is a risk that if Spain gets Brazil the Portuguese would need to trade through the English and lose a cut of the profits. Also has a ripple effect innthe interior of Africa and on the coast, depending on how it effects the demand for slaves.