Amazon.com Inc's. more fragile than-anticipated second-quarter results have sent its organizer's fortune tumbling. The net worth of Jeff Bezos fell $13.5 billion get-togethers' reseller's exchange results missed Wall Street's assumptions and foreshadowed a finish to the retailer's pandemic-powered deals flood. The drop eradicated 80% of his abundance gains for the year. Amazon's offers dropped 7.2% …