Some of this might change before it launches, but:

– You may not trade between alts

– If you put a buyout price on an item, it does not activate until the auction has been active for an hour at least

– If you bid an item up more than the minimum increase, it keeps your bid secret and places it as the minimum. If another person bids less than you, you immediately beat their bid.

– There is a maximum initial price based on the cost of the item.

The idea of most of these precautions are to prevent easy sending of Flezz from one account to another.