I did this a few times unintentionally a while back, before I knew that each sale costed electricity to the store. I just clicked the "Buy" button a few times in stead of typing a number yk
Maybe I'm being the Devil's advocate but maybe he isnt aware? Then again.. @l3nt1lk4's profile does say "Anonymous Market Manipulator", which probably isn't something you would say if you had good intentions.
Is there a way for stores to block other people from buying in your store?