Green Stamps slot machine strategy?

It doesn't matter how much you are betting when you get the free-spins award......they occur with 25 lines covered at 10 credits per line on the penny machines.
I've had at least 50 'plays' on these machines......a play being a machine with at least 500 stamps filled already, on the 1st tier.

I found one (1) Green Stamp machine at Ho-Chunk Casino around Wisconsin Dells. There were no stamps on it, so I passed it by.

[john9fingers]

Found one (as of July 2009) at Harrah's Rincon ( an Indian Casino partnered with HET ) located in Valley Center ( an unincororated area ) of North San Diego in
Southern California Ca near Escondido , Temecula , Oceanside , San Marcos

It's directly in front of the Total Rewards counters ( near Cafe Cappucino )

There is only 1 one available - they might move it, so if you don't see it ask
them to check.

It's a five cents ( 5 cents ) Nickle machine.

I posted this in other forums and people were like calling it scamming and opportunistic, but how so? I can't help it if people don't know how to play and leave when they almost fill up the stamps.

I've made FREE easy money , gotten Easily into Diamond tier and then into Seven
Star Tier Level status , FREE weekly hotel rooms , FREE daily meals , FREE trips
and FREE golf by simply playing the GreenStamp Slot. It's almost guaranteed and
I've been making a living waiting around for people who don't know to play the
game to put on the stamps for the accumulative stamp collecting bonus round.

I love the free bonus rounds!! And Rincon doesn't care if you stalk the machine.

You just have to be patient and wait for the chance to play ( win )!!