PSP software also tends to cost more (a fair amount more, even) than DS software, which generally tends to yield more profit/unit, along with more revenue/unit.
The PSP is doing fine. Its a premium handheld -- its ridiculous to expect it to hold even 50% marketshare relative to a cheaper handheld like the DS, or to have an attach rate equal to the cheaper-software DS. It fits very well into the space that Nintendo didn't really occupy with the DS.
If the PSP held even around 40% markshare, its net software profits might equal or exceed that of the DS, even with the current attach rate, and Nintendo would be seriously considering releasing a new handheld to compete.







