<<I wonder which rule of aquisition this falls under? :-) >>
A couple of possibilities:
#10. Greed is eternal.
#19. Satisfaction is not guaranteed.
#42. What's mine is mine. What's yours is mine too.
#49. Everything is worth something to somebody.
#61. Never buy what can be stolen.
#116. There's always a catch.
#181. Not even dishonesty can tarnish the shine of profit.
#231. There's a sucker born every minute. Make sure you are the first to
find each one.
#260. Life's not fair. How else would you turn a profit?
I'm sure there are others.
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