More customers = less money.
I just got back from CES in Las Vegas (more on that later..if I get to it!) and learned what I thought was a fascinating piece of information from a cab driver.
His take: he actually made less money during the busy CES period, unlike my natural assumption that the busy convention period may be great for business. The reasoning: the crowd and the traffic jams it resulted in meant a journey that would take 10-15 mins was now taking 45 mins. So even though there were in theory more rides available, it took 3 times as long to complete a single, so net-net he believed he was doing fewer rides (and less money) during the day.