Almost all businesses want to get people "through the door" to your website or product, and our experiment shows how you can do that for a relatively low price.
A logical follow on would focus on the landing page and conversion, but that is beyond the scope of this original experiment, which was to show you the mechanics of lowering your CPC.
Slightly aside, aren't the ads targeted to Pakistan cheaper because the ad costs as a proportion of revenue per item are likely to be far higher if the ads are simply charged as if for a company operating in a "richer" nation? Isn't ad competition higher in richer nations?
To make it clearer - using the Big Mac index - Denmark comes in at $5 and Malaysia at $1.50. I'd expect advertising costs to people in Malaysia to be at least a third of those to people in Denmark (barring other over-bearing factors).
We touched on a lot of this in the article, and in fact the title clause "(and why you might not want to)" was referring specifically to that point!
That being said, there is a tremendous amount of useful techniques you can learn from this approach, and you can choose apply those towards whatever demographics you are marketing to.
It's up to each person to decide the specific goals of their ad campaigns, but I'm hoping this article outlines some techniques that will help you achieve those goals.