FIV cats do have to live with other FIV cats, absolutely!!! It's nice these guys have each other and I hope someone adopts them!! I have a special needs kitty (not FIV though) and he is so wonderful - I cannot imagine why anyone would not adopt a special needs kitty!! And FIV cats can live long lives - they just need to be in the house (where cats should be anyway!!) and have lots of toys and a few extra vet visits now and then. There is a wonderful diary (The Diary of the Mad Kitten - silliconhell.com I think is the domain of his humans. It's very cute!) by a kitty with Fel.
"There are two means of refuge from the miseries of life: music and cats" Albert Schweitzer