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... without your bet. You are paying 1 bet for a 10% chance at 14 bets. so your call (last to act, drawing to nuts, no other way to win, etc.) has a positive expectation of .4 bets (14*.1 - 1).

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but when you win you get 10% of your bet back making it an expectation of .5 bets.

example:
out of 10 times you win once
9* you net -1
1* you net +14 (the pot:15 - the one bet you put in)

(9*-1 + 1*14)/10 = +.5 bets