Although often used interchangably,"fixed price" and "BIN" are not exactly synonymous. At the top of the listing page there are three options: Auction, Fixed Price, and Store Item. "Auction" refers to a listing with a minimum bid price, to which you can ADD a BIN price as a buyer option. "Fixed Price" refers to a listing with a BIN price only (no bidding). "Store Item" refers to an ebay store item, also with a BIN price only. So "fixed price", when used to refer to an Auctiva listing, refers solely to a "BIN only" listing, even though BINs can be found in all three types.
Not a pest, I just hope I didn't confuse you more.