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.
And, as other have pointed out, if the bitcoin and litecoin will be accepted by the porn industry, the they will risevin value. Not all the porn is free. The current porn payment processor is a jackass, denying payments without reasons,because they are the only ones that accept payments for porn. The pron industry have made the difference in video standard and in the HD standard, and I think it will make the difference in the crypto coins. If you think that porn is free, remember this: the gals and guys from porn don't fuck for free
MTGox has a very big user base, far bigger than this forum, and a large number of those people who are willing to spend $1000s on bitcoin, don't know that litecoin exists.
If you do know it exists, you are going to be buying it on BTC-e or where ever, but very many people don't trust that site because its not American - damn racist, I know, but that is life!
Anyway, once they see it on MTGox, they will start to buy it, because they trust it
Simple!