There are some good advantages of Maven. It allows you to get all the advantages that other projects use these are not exhaustively listed.
Maven is an easy way to manage your test project
It is very easy to include dependencies for your test code if you are using Maven.
You can easily configure to different browsers through maven profiles or parameters
You can extend your project with maven plugins for example (test reports, creating test clients from web service contracts, there are so many plugins to configure/use)
It becomes easy to plugin to CI, You can run the same build locally and via a ci tool like jenkins by setting up a maven build job
See the following Selenium Tutorial to learn a full feature list which really enables you to take the same advantages for a code project to a test project.
Here is a Selenium Testing Course which you can take up to learn it in a better way.
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