I think no, max 2000rmb (no sure per visit or per submission ), cos I try to verify the whole day and contact their cs, finally found that my acc is no problem for tour pass but max 2k the whole period

yes...

generally it can use from supermarket to hawker, but I am failed to use it when ride on bus, after scan the bar code, unable to paid due on failed to register (no China phone number and IC). So beware of those might need to reg & paid...