The only thing that matters about having a license are two of the most important things.
1. Access (to both the MLS and the houses)
2. Listing fees (if you know what you are doing as a listing agent) and offers
The most important part of getting licensed as an investor is to have access whenever and wherever you want it. Not just to the MLS, which will save you immeasurable money on understanding comps, but to the homes. There aren't a lot of agents who like showing investors 100 dumps to buy one.
If you are a good agent, most brokerages will let you list your own flips and although you will still pay your split as a secondary residence, you won't have to pay the percentage to an outside listing agent. BUT, if you don't know what you are doing as an investor or agent, do not ever list your own property. And being able to write your own offers quickly is paramount instead of waiting on an agent who doesn't care about your 80k dump that you can flip because he or she isn't thinking of the flip.
The money is all relative, it's about what you are going to do with the license if you get it. How will it help you as an investor.