Citibank is another bank i know, stock up on 50 dollar notes - because its cheaper for them to dispense 50 dollar notes vs 10 dollar - considering the qty of the notes that they have to stock & maintain.
Firmly believe that DBS / POSB doing this in terms of cost consideration.
the reason of more customer withdrawing 50 dollar is crap. Like this, you are forced to withdraw 50 / 100 / 150.;..if your account suay suay got 40 and you need 20 to take taxi ...u r fucked.
Citibank ATM machines use to dispense $100 & $50 notes. In Jarkarta they have atm machines which will dispense 50,000 or 100,000 notes.
Now that they are now going after the "lesser mortal" market, their ATM machines are dispensing smaller denominations.
ATMs are getting inconvenient & even dangerous with the skimming problem, Nowadays I keep a tin with some cash for day to day use and only go to the ATM to withdraw enough cash to refill my tin can.