slartabartfast
I would suggest that if you can sell a million recordings, you probably can get by without a Cakewalk endorsement.
Making .05 per recording is only $50,000 which is pretty much equal to the average salary in the US by most reports. Which is also about average for a recording engineer.
If recording is your full time job, most would hope to be seeing a million recording sold across their customer base, or close too it to keep afloat.
I'm not sure on the OP's question, but I'd bet it isn't about one licence really. I have the opportunity to run some clinics at a music school, right now they are set up with pro-tools, but I told them I was only interested in showing others how to run Sonar. It is a scenario like that where an endorsement makes sense. I (the instructor) exposing multiple people in a learning environment how to use the program, a better than educational price structure would make sense based on exposure, the value the endorcer brings to the relationship, etc.