How I play Rising Star for max Starbits

So I just started playing Rising Star, if you can call it playing because all you have to do is press the Start button and wait for the timer to end. How long that takes depends on the type of mission you have chosen. I actually like playing Rising Star because I can do other stuff while the timer runs.

Now I noticed that the amount of Starbits you can earn depends largely on how many fans, luck and skill you have and that owning cards can increase those numbers.

When I started Splinterlands I was given the advice not to buy card packs in game but specific cards from the market. So I have done the same in Rising Star and instead of buying card packs for 10,000 Starbits each I bought a bunch of the cheapest cards on the market I could find that would give me as much fans, luck and skill points.

My aim is to quickly increase my daily income from the game by investing in cheap cards until I am able to buy card packs from my daily earnings. Any thoughts on my approach ?