If the make offer button is provided, you can make as many offers as you want to on that item. Each unaccepted offer results in the reserve being instantly lowered on that item for everyone, so you never know how low the reserve is on an item! For instance, an item could be a Buy Now for $100.00 and the reserve on the Make an Offer could be as low as $1.00, depending on how many offers have been made on that item! Each offer costs one credit. You can get credits by purchasing in packs of 100 or by earning them. You can earn credits by simply bidding on items during the live auction events- watch your credits accumulate in the top right corner of your screen while entering a bid! You will get to keep these whether you are the winner or not!