Same. I also come from Indonesia, specifically on the island of Sumatra. I myself am currently still unemployed and have no income from work. However most monthly incomes in my area are also around $150-200 as this is the minimum wage standard.
When talking about the cost of living, of course each region is different. Moreover, living in a small town means the cost of living will be cheaper than in a big city. Lombok is a tourist area, of course the cost of living is slightly higher. However, what is clear is that in each region in Indonesia the cost of living is definitely different.
It's true, this difference is caused by Indonesia's geographical location which consists of islands. In my experience when traveling. The average cost of living in various regions of Indonesia, especially the islands of Sumatra, Java, Kalimantan, Madura, Lombok-Sumbawa, Bali and East Nusa Tenggara, is still somewhat reasonable and almost the same. This depends on how we choose. $300-$450 is more than enough to live in any city on the various islands, sometimes you can have extra money left over.
For eastern regions such as Sulawesi, Maluku and Papua, the cost of living there is more expensive, it can be 2 to 3 times the standard of living on Java or the other islands I mentioned earlier. This is influenced by the location of the island which is far from distribution or production centers. This results in higher costs for delivering goods and services. This is the factor that causes basic commodities there to increase up to 2-3 times.