I happened upon these very machines a few weeks ago and had a similar experience to you. My reaction was not that they were hustler-proof, but rather they were hustler-bait, displaying false Next Hand Multipliers in hopes of duping some smarter players (I'm not sure if this would be illegal, unlike revoking a legitimate multiplier from the new player, which is definitely illegal in Nevada). In the end, I couldn't stay long enough to figure them out, as this trip was primarily a Take My Girlfriend To Vegas affair. But I had forgotten about them and are glad you started this discussion.
--- In vpFREE@yahoogroups.com, Tom Robertson <007@...> wrote:
>
> I wrote:
>
> >This was very traumatic for me. I hope someone can explain it. I saw
> >many multipliers on a machine at the Mirage and when I changed the
> >number of coins bet, they disappeared. The machine looked a little
