Why is LTC needs to be more valuable if is listed to GOX. LTC is already the no. 1 alt-currency, is listed on all the majot exchanges, if someone will want to exchange LTC for USD or EURO si very easy without GOX. The development team of LTC is again active and the fixing of the fees is a big improvement and a more important reason for LTC to rise in value, than the listing on GOX.
Well you see...there's this thing called supply and demand. I dunno if you've ever heard of it...
Gox (according to them) has at least 4 times the number of users that any other coin exchange has. So no, it is not listed on all the "majot" exchanges.