Jesus used illustrations all the time, along with viewpoint questions. Also, if a person didn't get one illustration, he'd use a second, even a third. Like he did in Luke 15: a lost sheep, a lost coin, a lost son.
I agree, and illustrations are a great teaching tool. They are memorable. However, we do have to ask ourselves, do they apply? How do we apply them? Nowadays Christians don't pay their taxes from the mouths of fishes. But I think the principle has remained.
To me, the point of the Real vs. Fake Currency illustration is straightforward enough. Nobody likes being defrauded. The Creator even moreso. It takes a mature sense to know the value of having the real thing. There are possibly serious consequences such as jail time for using Fake Currency. There are, likewise, serious consequences for trying to fool God in our worship to him. Our relationship with him will be a sham, as well.
I also agree that it is cricital to learn if you are looking at the real thing. However, the suggestion that one does not need to study anything but THEIR currency is false. So the illustration, as used by the society, DETERS members from verifying their claims. Deceptive.
A similar point is made with the Dirty Lollipop illustration. Nobody wanting a sweet candy likes the taste of dirt with it, or the thought of catching a possible disease from an unwashed treat. Maturity is needed to overcome the innate desire to pick up and taste the dirty candy. There are possibly serious consequences, such as indigestion, for ingesting a sweet from the gutter. There are, likewise, ill effects even in our health for engaging in illicit activities.
Since this is one of my JW husband's favorite illustrations, I thought long and deep about the implications of this illustration. A dirty lollypop suggests that the (pure) early Church was corrupted on the outside. If one washed off the lollypop, presumably, one could enjoy it again. BUT, doesn't the society teach that by the second century, the Church was hopelessly corrupted? That suggests that the corruption was endemic. So, instead of saying, "Would you pick up that sucker?" a better illustration would be thinking too long about the origins of a hot-dog.
So, to take the illustration further, what is the pure lollypop? Like the Bereans, we can ask what teachings are to be embraced, and which discarded? Is the society as "pure" as they claim? Is there a core of purity existing in other churches?
There are definite signs that the society is getting ready to discard a couple doctrines. First, they are gradually getting rid of the blood doctrine. Also, they are changing the generational teaching and the makeup of the annointed class. This tells me that their original interpretation was flawed, or corrupted. Would you eat a hot-dog off the ground, if they washed off all the dirt? Especially if you had scrutinized their origins and found them lacking?