s/b is starting bid, allowing a seller to give a starting point for where they value the item and a minimum offer.
r/b is reserve bid, the minimum they would sell for but would leave bids open a bit after it is reached if there's strong interest in an item.
b/o is buy out, a price a seller is happy to receive to trade the item outright when the value is offered.
Does this mean bidding less than the r/b is useless since the buyer wont sell below that anyway? I always thought r/b meant "if this price is reached i will sell within x hours" but that they could sell for less than that if there were no more bids.