Dont think there is any agent there now, poi pet is the worst place to do visa ran. Even agents avoid it now. (the cam side might not stamp you out if you do not stay for 1 day in cam.)
some want it to show face, some will also borrow a huge amount to be displayed. some needs it for ego. some might not want it, some might ask for a certain amount etc... cash or gold is common.
if you can spend a whole day there ? you can get re-entry at airport ? (or go get the Q for 90 days first, than get another Q for re-entry later, but you will risk getting scolding if you miss your Q number 🙂 )