Is real estate license worth of pursuing for a landlord?

[Beny Bini]

Hello, I have few rental properties.  My long term goal is to expand more in rental properties, which means, I don't have a desire (at least for now) to be a real estate agent full time.  I was wondering I should take courses and get licences real estate agent? 

The primary reason that I have been thinking about the license is to expand my knowledge and networking with others.  I have some friends who are nay Sayers and their argument is that I have to renew the license every year, which means that I have to take exams every year with some payments...

Thank you in advance for your insights on this.

Ben