Is there skill in rolling a spinner?
A spinner will move along one of two paths every time you spin it (clockwise or anti-clockwise).  There is no variation in the spin which could occur with dice, such as bounce, roll, etc.  It's always travelling consistently along one path.  This means that the distance it travels is always dependent upon how much force was used to spin it.  Therefore, if you get used to a particular spinner, you can adjust your flick power to make the spinner travel further or shorter depending on need.  Hasbro's Game of Life has a twist spinner instead of a flick spinner, but it's the same concept.  Growing up, my brother and I were able to figure out how to spin the spinner with enough force to fairly reliably get the number we wanted.  Every spinner will be a little bit different between copies of the game, so you may need to calibrate when playing at a friend's house.