Yes, too small.

Just take a look at the maximum bets, needed a raise cause in x40 can bet 500,000 IDR meanwhile the rest only 50,000 IDR. Without multiplier 500,000x40 = 20,000,000 IDR.

If we followed the basic multiplier (without bonus multiplier), it should be:
30 - 666,666 IDR
20 - 1,000,000 IDR
10 - 2,000,000 IDR
8 - 2,500,000 IDR
5 - 4,000,000 IDR
2 - 10,000,000 IDR
1 - 20,000,000 IDR