2) Spinning it together will increase the odds of hitting better rewards.
This is not true. It doesn't make any difference whether you play 100 spins at the same time or you play 1 spin daily for 100 days.
Take note that every time you play the wheel of fortune, the outcome is determined through some mathematical calculations and they are completely independent from each other.
While you are 100% right, I guess it is more a pschyological thing. Similar as one you are having a bad streak ona game and just keep betting and even bet higher, as you think that the chances you will hit it are a lot higher even though they are the same. Still happens to me from time to time.