Oh sure..I like to play them when they are around 300's -999

If I am going to stay on a slot for a while, I want to get the most out of it.  It is just warming up around 80.  To me, it starts to start hitting around the 300 range, and now that I am talking to you, I should take a minute and look to see what the number is when it starts drying up.  I never actually have.  I did go on a slot that only pays 6000 coins, and have noticed that it  goes back a couple times (back to 80) while I am playing.
So it does work.  This is when I decided not to play small coins (6000) unless I am only making small deposit, and only planning to play for a very short time.
If I want to get my money's worth, I will put in a few hours, and play the larger and  coin mid range.  Like yesterday, I played for 6 hours, 300 range, 15,000 coins, and won $7000. Nice way to start the New Year!