I think we are generally overestimating the short-term effect of positive news (like wordpress, goldmoney, bitpay,...) and underestimating the long-term effects.
Sure, on good news
traders with fiat at the exchanges
will buy. But keep in mind these people are prone to
take a profit even on a $0.15 rise, so the
effect will be short-term and short-term only.
No new fiat comes in through this mechanism so there wont be a lasting effect.
The long term effect of good news bringing in fresh blood on the other hand
is too easily forgotten about by the time the news is old and we then ask ourselves: "why the $0.30 rise on
no news?"
See for example the reasons I gave for justifying my intution of a rocket about to be ignited in this thread on Nov 5th last year:
https://bitcointalksearch.org/topic/my-intuition-says-were-sitting-on-a-rocket-about-to-be-ignited-122454. We might still see the effects of this 2 month later. Think about it:
it takes time to go from hearing about bitcoin to actually making a sizeable purchase: First the guy has to get his initial infos about bitcoin. He will then ponder the idea for a while and let the overwhelming info sink in (a week or two), then revisit bitcoin and get excited, take another week to make the decision to get in. Then it takes a week for him to actually get money to an exchange (yes, a majority of newbs will think mtgox is
the way to buy bitcoins). Then he will wait for a dip or rally to actually get int (another week or so). Add this up and you have 1-2 months.
;tldr: the current rally is fueled in considerable part by newbs generated by 2 months old good news. 
