Standing says just knowing they have the safety net means people relax, plan, join in activities and socialize more. They lose their sense of shame, poverty, and inferiority. Violence and crime decline. They feel able to take a job. Their attitudes change, their relationships change, the family get along better, kids can stay in school .... it literally makes all the difference in the world. So yes, you're right - it's all about economic growth.
RE: Universal Basic Income Profitable? - Yes!