The connection between the cashless payment and the tooth fairy?

The following words and phrases refer to a specific thing in the video. What do you think this thing is? Why would these words refer to it in this way?

Nickel and dime

Let bygones be bygones

Goner

Gross

Ceased to exist

Demise

Relict

Flu virus

Weary and inevitable

Which of these phrases means:

1.       To destroy something bit by bit

2.       Something has to be lost and forgotten forever

3.       Something is about to die

4.       Stopped its life

5.       Disgusting

6.       Last known example of a species

7.       Death

8.       Physically and mentally fatigued

9.       Impossible to avoid and prevent

Watch the video and check the context of the phrases.

What has the tooth-fairy to do with cash? (and btw, is it ok to believe in the tooth fairy as an adult, what does it say about you? http://en.wikipedia.org/wiki/Tooth_fairy)

Why is cash bad according to the author of the book?

Is producing cash profitable?

Why is cash gross?

Why is cashless transaction fun?

Who depends on cash mostly in today’s society?

Would you miss cash once it’s gone?

How does the situation shown in the video differ from the situation in Poland?

One thing is for sure, I would sure as hell use one of these magical taps in my home. 

Do you happen to know where to get one?