Software Sales Per Title

PSX
57,848 Japan
278,652 America
185,479 Eu
120,582 Worldwide

PS2
44,367 Japan
379,195 America
164,097 Eu
133,647 Worldwide

PS3
25,000 Japan
115,385 America
70,909 Eu
68,750 Worldwide

PSP
23,168 Japan
124,138 America
105,464 Eu
65,000 Worldwide

About all I can take from that, is that compared to PS1/PS2 the PS3/PSP software sales really suck.

DKII, you're using numbers from different timeframes to arrive at those numbers, it doesn't work.

 The mod/hacking scene for the PS2 and Xbox were just as big as the one for the PSP(if not bigger) and neither of those platforms had such low software sales.

The PSP was marketed and hence bought overwhelmingly as a multimedia device that also plays games instead of the other way around. It makes a very sleek mp3 player and portable video player, which has driven a lot of its hardware sales. It's also very attractive to hackers(as was the Xbox) because of its versatility, so that is also driving a lot of the hardware sales. The PSP also suffered from a severe gaming drought until the middle of 2006 with the majority of it's titles being PS2 ports(the term PlayStation Portable was being taken a little too far), and even after that, it still doesn't have a lot of pick-up-and-paly titles or must-have titles. If it didn't have the multimedia features and/or wasn't hackable, then its hardware sales would be significantly lower. This would have led to a higher attach rate, but its software sales would still be rather low.

So PSP was bought primarily as a media device rather than a gaming device? Was there a study about this?

And piracy actually helped the PSP through its hardware sales? Kinda makes sense

Wow , the PSP software shipment passed the 100 million mark ... thats ~ 3-1 attach ratio/console , until the end of 07 ... cool :)