how do garang guni men make money?

Answer 1

They collected unwanted items from households at a low price, and sell it to people or companies (such as re-cycle companies) at a higher price.

Answer 2

There's no such thing as 'garang guni'.

Are you referring to 'karung guni' men?(pronounced as 'karang guni' by some people).

You can find some info here:
http://en.wikipedia.org/wiki/Karang_guni

Answer 3

Yeah and sometimes, they actually manage to collect some rare antiques so they can sell them off to make some money too.