But you can sell them, far as i know bitfinex allows you to sell them or exchange them for ethereum and bitcoin, why dont you try to do it? It is a shame that you can not transfer it, i dont know why the fork has been released if there is not even a live blockchain to send and receive those coins.
Anyway, try to sell them, bitfinex is a good exchange for all kind of bitcoin and forks, but btg is very cheap in that site, below $120 i guess..
They're currently trading BTG in supporting exchanges but only within them. You can exchange to BTC now but the price is low in bitfinex (0.019) while at Yobit it's at 0.039. You can wait for Nov 1 for the launch and then see if interest on the coin rises or falls.