There are a few pros to getting your license including but not limited to:Access to the MLSBeing able to see properties quickly, without needing your agent to tag alongSaving half the commission on the sell side of your dealBut there is the additional costs of continuing education and splits or fees you may pay to hang your license with a brokerage.

Hope this helps, vote for my post if you like it.And Tag me if you have further questions so I can answer.

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Are there any online maps of neighborhoods tagged with these unofficial ratings?  

Thanks for the tags! 

Here are some recommendations for you:Find and connect with other BP members that are in your area: https://www.biggerpockets.com/search/usersSet up keyword alerts to be notified of the topics that interest you: http://www.biggerpockets.com/alertsRead Beginner’s Guide: http://www.biggerpockets.com/real-estate-investingCheck out BP Podcasts: https://www.biggerpockets.com/podcastIf you wish to tag someone in the conversation on the forum, type @ followed by their name and then select the name of that person which should appear below the comments box.

It might help, tagging Brandon himself on this thread?

Here are some recommendations for you: Find and connect with other BP members that are in your area: https://www.biggerpockets.com/search/usersSet up keyword alerts to be notified of the topics that interest you: http://www.biggerpockets.com/alertsRead Beginner’s Guide: http://www.biggerpockets.com/real-estate-investingCheck out BP Podcasts: https://www.biggerpockets.com/podcastIf you wish to tag someone in the conversation on the forum, type @ followed by their name and then select the name of that person which should appear below the comments box.

Thanks for the tag Ned.Pavel, the DC metro area is perhaps the metro area with the smallest number of 2-4 unit multifamilies in the entire country. 

@Dave Foster not sure if he got tagged above. :)