If you end up buying a few items from the same seller they can do a combined shipment but you rarely get the same buyer items since they only let the sellers sell 10 items a day. It is different for the sellers that have their own auctions.

There is no charge for each bid. Just payment at the end of winning the item. If you lose, no payment, no fees. It is best to pay for each item as you win... it seems there is a shipping charge per item not a combined shipping charge for several wins. Free to bid. Pay when item's won.

No, there is no charge. Please bear in mind that you must pay for the item you won, however, right away, if you plan on bidding on more items. This seems like a neat feature, but it conflicts with the ability pre-bid on certain items. If you pre-bid on few items, your bid will be recognized only on 1st item. If no payment received upon the end of the auction, your other pre-bids will be annulled, so please keep that in mind.

Just high shipping

No there isn't a charge for bidding. If you win you buy

No. Only if you win...