Chromes way I feel is the simplest & is the way I prefer to do it.

The purists would argue that the true figure is the amount of Liability that you risked in trying to acquiring that profit.
e.g. Bet $10 on 100 selections all being say 10/1 shots to profit $50 at the Liability of risk being $10,000 loss if all were not successful .
10 x 100 x 10 = 10,000

Therefore POT to liability would be $50 divided by $10,000 = 0.5% POT

This looks a little frightening to me , but I guess that's another version of reality.

Cheers.

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Cheers.