Is David Greene wrong?

[Sean Mcmahon]

I apologize if this is a newbie question and for the provocative title :)

In David’s book Long-Distance Real Estate Investing, he says its beneficial to find an agent who is also an investor in the area. I understand the benefits of the on-the-ground knowledge and the unique perspective an investor-agent brings.

But won’t that agent keep all the best deals to themselves?