There will certainly be an effect on the price of Nxt. Particularly if we get more than just a NXT/BTC trade pair.

And... if I'm not mistaken, one can trade any currency listed on Vircurex against any other. So we are about to get our first NXT/USD and NXT/EUR trade pairs!

They just don't list/link all the trade pairs on the front page (it makes sense because there are "N choose 2" possible pairs, where N is the number of distinct currencies. With the addition of NXT that will be 18C2 = 153 possible pairs).

E.g. On the Vircurex Homepage they list LTC/BTC. Clicking that gives the following URL "https://vircurex.com/orders?alt=ltc&base=btc". Changing "base=btc" to "base=eur" or to "base=usd" gives the following:

https://vircurex.com/orders?alt=ltc&base=usd
https://vircurex.com/orders?alt=ltc&base=eur

Admittedly these have lower liquidity because they aren't advertised very well. Ergo, I think we need to do our part to promote the NXT/USD and NXT/EUR pairs! Who's with me!? Perhaps if the liquidity of NXT/USD or NXT/EUR increased the Vircurex team might put some links to them on their homepage!