Aside from the other explanations, you also get a slight competitive benefit. If the paper is good, you get to use the ideas in the paper ahead of other people.

Aside from the other explanations, you also get a slight competitive benefit. If the paper is good, you get to use the ideas in the paper ahead of other people. Though everyone uses arxiv now, so not so much anymore. Also you get a sense of power anonymously judging your colleague's work..