there are still new people "investing" in pirate? i had the impression that the "market" is already saturated, and some believe that his "default" is imminent.
Well, some people were withdrawing (eg MageD) and everybody was nervous about his vegas meet-up. Since it seems to have taken place, its likely there will be a wave of new investors. But that doesn't mean default is no longer imminent, indeed it could very well be. It just depends on the market (both the PPT market and the bitcoin market) and pirate's exit strategy.
The increase in price is not due to an increase in the exchange of goods and services for bitcoins or favorable news, the two traditional causes for rallies.
Everyone is buying BTC to get in on pirate's scheme, pirate passthroughs, and other pirate like "lending" schemes.
Obviously earning 3300% a year on BTC is more attractive than 0-10%/year with USD.
The entire bitcoin economy is shifting towards lending and various financial instruments.
If pirate were to default, would the price crash? There would certainly be less incentive to buy BTC. Of course, pirate might have all of the coins by then... so there might not be many sellers.
There is an unhealthy amount of lending schemes going on right now, but I think you might be overestimating the proportion of new buyers they are attracting.
I see evidence for a variety of new investors: the reuters article mentioning the ip addresses of wall street firms visiting mtgox at the beginning of the year, silk road forum post count supposedly 50% of the bitcointalk post count, butterfly labs mining investments, coinLab investment by Ycombinator.
The fact that price has held up so well against the utter vaporization of bitcoinica shows that the bitcoin is market is more resilient and decentralized than I had anticipated (unfortunately for myself, 20% of my funds were in a long position on bitcoinica). So I don't think that a crash of pirate's scheme would affect the market. And actualy from that, one can infer the converse that the success of his scheme is not what's currently driving the price increase. I may be way underestimating the size of his scheme, but I think its fair to say that bitcoinica had a far greater market penetration than pirate does. Of course, MtGox remains the greatest centralized point of risk to the bitcoin price.