Okay so maybe not so much a scam but an incredible waste of time for many.
They have these coupon book shows where they explain how you can save big bucks on all of the shopping areas at each island. The catch is they convince you to shop only at the approved merchants.
They say this is because your purchase will be protected. However we quickly found that these merchants were much more expensive then the merchants who were not on the list and that cruise lines get a massive percentage of the business sold to these merchants because they drop off a few thousand people at a time to these locations.
Don’t buy the coupon book. When you get onto the island just skip the first several groups of merchants and go on to buy the same things at a much cheaper price at the surrounding merchants only a few steps away.