Why bet the pot?

[MathEconomist]

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Hero put in 60+150+450=$660 to win a pot of $1350= 2.05-1

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This is the big error. In doing these after the fact calculations, you can't count the money you put in as part of the pot because you don't win it when you win, you simply don't lose it. Your actual overall odds were around 1-1 on what was a 2-1 shot on the flop (and presumably worse preflop).

As far as having someone call and the (potential) draw hitting, a method I like to use when I don't have good reads is simply not to put in enough money that the other person had correct implied odds to draw. This way you've insured that when you're up against the draw you're a long run winner. You will lose some money to bluffs, but even then they are likely long run losers since the scarecards don't hit THAT much more often when no one is holding the draw.