What does the number on the Bog's Counter mean in Kaiji?
Your confusion stems from the difference in the number systems used in English and Japanese. Take a look at this chart. Note that where English would be ten thousand, Japanese has a word for that, 万 (man), and from there starts to count similarly to the English "thousand": 10万, 100万, and... 1000万. So it would be a natural cutoff point on a display: Japanese people would understand that the counter is cutting off five 0s.