It is very simple: moment I see prompt for tipping on the register after I picked out something, carried it to the register and rang it up myself, is that momen

It is very simple: moment I see prompt for tipping on the register after I picked out something, carried it to the register and rang it up myself, is that moment I am going to leave everything behind and head on to the next store. Tipping is for OPTIONALLY AFTER the work/service was performed: period.