BANNING BUYERS

HOW CAN A SELLER BAN ME FROM BIDDING ON AN ITEM AFTER I ASKED A LEGITIMATE QUESTION ABOUT THE ITEM BEING LISTED AS IN BOTH QLD AND VICTORIA. IS THIS NOT A VERY BAD BUSINESS DECISION AND CERTAINLY WOULD NOT PRODUCE FAVOURABLE FEEDBACK FROM THE BIDDER OR BY WORD OF MOUTH. I DO NOT UNDERSTAND WHY THE SELLER WOULD DO THIS AS I AM A GENUINE BUYER.