I know there are activation fees but I didn't know there are per-transaction fees. A system like Bangkok's Rabbit cards would be better (no fees beyond the fee

I know there are activation fees but I didn't know there are per-transaction fees. A system like Bangkok's Rabbit cards would be better (no fees beyond the fee for getting a card) or Japan's SUICA cards. They are transportation cards that also get accepted at convenience stores and some restaurants and you can top them up at any train stop.