Recall that your max budget is $5,000,000 of offers, so the total sum of your offers needs to be less than $5,000,000. You will be charged the value of your offer even if the seller would have been willing to sell for less (You always pay your offer if it is accepted). If your offer is rejected for being less than the price the seller wants you pay nothing, but you don't receive the diamond. Your profit will be calculated as the sum of retail price the diamonds will eventually sell for minus the sum of your accepted offers. You make no profit on rejected offers