For someone working on a cruise ship to make 2x to 8x that and have a substantial portion of their living expenses covered is not at all "terrible" by their home country's standards, IMO.
You can't use generic statistics to obtain significant insight in to people's lives: those on minor incomes are probably dependent / semi self-sufficient / agrarian / fishing / unbanked, so simply do not appear to have or need much money. In addition, barter and sharing are still widely practiced amongst agrarian communities.
For some perspective, in a report from recent (last 2 months) research that I read this morning, the very lowest household income amongst Myanmar migrant workers (largely factory workers) interviewed in Thailand was almost exactly this figure (7kTHB), whereas 2-5x this figure (~20-35kTHB) was common.
Similarly, relocating Chinese villagers I met last month reported being given 290元 (~$42)/head/month + lifetime generous monthly rice/oil allowance + initial bulk hardship payment + free housing when relocated to facilitate a new hydropower project. A family of four Chinese farmers in this situation essentially receive this income forever without the need to work at all.
