Maybe it was my first experience with promoting that made me think it works. One of my posts increased by more than $76 within a minute of promoting it for $1.51
It's impossible to say if promoting was responsible for that alone but it's quite a coincidence isn't it?
I'm relatively new and haven't seen any apparent action promoting since.
Take it all with a grain of salt. I figured I was playing with "house money" just to see if it would work. It's a gamble for certain.