and US$3m

Do you have a source for that number? It seems incredibly low.

It is an interview in Thai with the guy who was sponsoring the water pumps.

So it was $3M paid for by a rich guy? Was he going to donate the money to charity if he didn't spend it on this?

I do not know the answer of this question.

Most of the money and equipment were donated.

While it may be true, not really the point GP was getting after.

Cost or donation, can we expect the same for every child in need?

[0] is the first source that popped up on a quick googling; the US alone spent 18 billion dollars between 2002 and 2014 on food aid (to hungry children and such).

[0] http://www.humanosphere.org/world-politics/2014/10/united-st...

Can we expect 1 person to sacrifice their life for every 13 children in need?

Helping every child in poverty requires a long term paced effort rather than a one time heroic one. As inspiring as this rescue was, it doesn't scale.

Especially in a place like Thailand where there is a lot of real poverty still.

What do you mean? The OP question is straightforward. How can you twist the meaning that much is beyond me