User blog comment:Hoboy03new/Lots of Indonesians in LT2/@comment-31045658-20180113161318/@comment-32756839-20180113201156

Probably, but i think they mostly just dupe money because usually indonesians have like 5Million money but their base has only cheap stuff and is usually empty.

So my theory is that they just dupe money and as you said they sell the money for robux.