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Why are some countries' currencies “weaker”? 
1:30 is not stronger than 1:79. These are just numbers. Trading 1:120 in 2008 and 1:79 now vs. trading 1:31 in 2008 vs 1:30 now is much better criteria to look at to evaluate the strength of the currency, and if you look at that you can see that the Japanese Yen is significantly stronger than the Bhat. While Yen gained 25% to its worth, Bhat gained nothing over the same period of time. You can also see that the Yen was very consistent, while Bhat was volatile over that period.