Hi Gonzalo,
I don't personally have my license but I can see the benefits of having one and the benefits of not. It just depends on what your goals are. I've met people that are part time RE Agents and it's working fine for them.
One investor in particular focuses more on obtaining his rental properties but uses his RE Agent License to provide access to MLS and see properties on his time (not on an Agents time). He also will act as an Agent for friends and family but doesn't do any marketing to the masses. He likes doing it part time and it works for him.
Another friend of mine is a part time agent and a general contractor. His wife is a full time agent, but he decided part timing for friends and family was the only way he could ''tolerate'' being an agent. The idea of someone not buying a home because the paint color was wrong just got under his skin. He keeps his license to buy properties they invest in.
This is a personal decision, there are pros/cons either way you go, just do what you feel is right for you and your family. If you're hearts in it, you'll accomplish the goals you have set!
Cheers,
Matt