I was just clicking around randomly in the game and ended up on the Music Promoter Page. There was a YouTube tutorial explaining the feature but I must admit, I skipped some parts and I clearly missed thing important.
From what I got from the video, you need to add some Starbits to the pool which is not refundable. Meaning you can't take them back to your Starbits wallet and use them to fund purchases and what not.
Once that's done, you need to place a bid on a mission which is one starbit higher than the previous bid. The bid will then stay in place till someone bids a higher price.
What is not clear to me yet is why the starbits that I didn't use to bid get eaten up? I had starbits in the pool but only used 450+ for my bids. But before I could take a screenshot, all 1,000 got used up.
I think the pool gets reset at Midnight UK time which means there's a long way to go so the amount of starpro I will get is definitely going to be less than 0.43. Hopefully the amount won't be too little though.