I do the same thing...Looking for old machines...I am not a fan of new machines...I play mostly penny machines...30 pennies a bet...That is high enough for me...40 pennies a bet...That is a little too high for me...
I bought a $50 FreePlay using MyVegas points a few years ago. I decided to play the $1 old style reels at Mandy Bay and won $5000, so it can definitely happen. I especially love that I was playing on the casino’s money, lol.