What does it mean for an altcoin when there is a large [volume] sale?

[Nanolucas]

I just noticed a sell order for 259K Worldcoins on cryptsy. That would mean someone's cashing out big time, but why would they do it now when the price is so low?

Will this crash the price of the coin since there's a bigger supply on the exchange now?

Screenshot: http://d.pr/i/8kIN+

[Callisto369]

Could mean someone mined a lot of it early and sees the trend moving downward. Was at an all time high recently at .0009 and maybe half of that was the magic number to dump. I don't know too many people who believe in the alt coins surviving long term save for a few niche ones.