Should we be allowed to change our PSN username at least once?

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Some people have had their PSN usernames forever. Some of us would like to change it. Of course, there should be limitations to changing it. For starters, Sony would charge a fee. Secondly, it would have to be appropriate. Lastly, it would be just fine it they allowed only one username change per account. They would have to make it where people couldn't take advantage of this feature. But this is definitely something I would like to see in the future! What about other Playstation fans?