To quantify and assess the inherent value of a betting opportunity, start by estimating the true probability of the event occurring through statistical analysis, historical data, or expert opinions. Convert this probability into implied odds and compare them to the odds offered by bookmakers. Calculate the expected value by considering the potential payout multiplied by the true probability, then subtracting the risk of losing, which is based on the probability of the event not occurring. If the expected value is positive, it indicates a favorable betting opportunity.