Fernandes estimates he has sunk £50m of his personal fortune into QPR club since he took over at Loftus Road in August 2011.
But the 49-year-old is determined not to make the same mistakes again, vowing to be careful with his dealings in the transfer market.
"I don't think I will be exploited any more," Fernandes said. "I think I allowed myself to be exploited but that's my choice.
"Agents are trying to get the best contracts and there's no two ways about it, I had to pay premiums.
"I've seen all of the parts that make football quite - maybe immoral is a strong word but they would sell their grandmother to do something.
"It's all part of the football ecosystem."