The first rule(s) of scams & cons

I believe these two quotes more or less encompass the concepts of scamming and con:


'Find someone who wants something for nothing, then give him nothing for something'

'You cannot cheat an honest man'

-Quotes taken from Hustle


Want to avoid being cheated by Nigerian scams? Or scratch-card scammers? Or opportunities to make insane amounts of cash for nothing (Really, a concept that isn't alien to the beneficiaries of the rubbish that is the NEP)? I think those two quotes provide plenty of hidden meaning, although I don't really agree with the second quote (I think it should be more of, 'You cannot cheat an informed, honest man').