YES! Confirmed by an auctioneer I know. Hibid auctioneers can see your "maximum bid" and in most states it's legal to "shill" an auction or to bid against the public bidders - to "ensure reasonable sale prices" per national auctioneers associations.

Also, anyone can set up an identity and bid against you. Although that may get interesting when they have to pay a commission to "buy" their own item!

I've personally experienced that type of shay behavior. Expensive lesson learned the hard way. HiBid takes no accountability of the Sellers & Buyers represented.