I cant say whether being on ltc and btc markets is good or bad, i really just don't know. but i would guess that if we were on a USD market it would really help. People see their alt currencies drop in btc value because btc is rising but some don't realise the value of their coin isn't actually dropping much if they calculated it in USD. BTC-E is the only exchange for alts that has a USD market as far as i know, and cryptsy are supposed to be adding USD market at some point. But in the meantime getting on as many exchanges as we can such as MCXNOW can only be a good thing.
Might even be a good idea to check for any Chinese alt-coin exchanges and try get on them too since the Chinese are buying up BTC like mad.