If we offload Melo and Iaquinta we can use that money, which is nearly 6 million, to pay someone who makes as much as Suarez easily. Not that that makes it likely we'll get him, but it's not impossible for us. We are Juve after all.
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If we assume he pays income tax in the levels of Riise (which I have no idea if it's true or not), Suarez would clear an after tax weekly wage of ~ £85,000, which is about £4.4 million annually. Yes, Liverpool apparently had money to throw out the window and paid Riise that much.