Generally speaking, in the public affairs domain, people tend to have a "free-riding" mindset and adopt a cold and rational attitude of "ignorance" towards voting. However, the website digg.com seems to break this characteristic, as there are always a large number of users participating in voting. This article starts with Downs' "benefit-cost" model of voting to analyze the driving factors behind the voting activities of digg website users. It is believed that it reduces costs overall, and due to the additivity of voting effects and the intuitiveness of diggspy, the expected benefits of voting have significantly increased, and the probability of gaining profits has also improved. As a result, users gain motivation to vote. Of course, the article also analyzes the negative constraining factors from the perspective of users' group strategies.