THAT is a great strategy for any machine whether it's pennies or dollars. The casino's LOVED it when everything went digital and you didn't have to pop in 45 coins per pull. If it's just credits people don't think about how much they are paying per spin.

Me personally, I like one aspect of the digital machines - they are a bit quieter and I get so overwhelmed in a room full of slots that any reduction in the overall decibel level is a good thing... hmmmm, make that 2 things - player tracking for comps. I'll gladly take a free dinner I might not have gotten before the machine could add points to my card...lol