For me all books from Jane Austen are great.

In some countries children still sit in their fathers lap, while he is driving.

I am still working with a manual caliper. Should have bought the digital one ...

Better than doing the same thing over and over again and expecting a different result (paraphrased from Einstein)

But how does this knowledge make a difference? In the end there is less in ones pocket anyway.

Depends on the country. If it is not a custom to tip (because the price already includes the staff fee) than don't do it.
Just because you think the price is cheap. There are still locals that have to pay the raised prices later, when you have already left the country.

Maybe that could also work. Depends how closed it is I suppose.

For what would such a small robot be used?

If you have a closed printer. You can dry your filament in that.