Spiegel said:
There is a difference, Capcom can release Monster Hunter on all the consoles.
Nintendo can release games on other consoles, but they don't. It's not about what Capcom does with Monster Hunter or what Nintendo does with their games. If you thought that was the point, you got it exactly 100% wrong.
Anyone releasing a game on the PSP is in competition with Monster Hunter directly. Anyone releasing a game on the DS is in competition with Nintendo's games directly. That's the point. If, hypothetically, there was a system where just football games sold well, it might be useful to break out football games when discussing software sales.
Breaking out games is a way of showing whether or not the software ecosystem is robust or narrow. You can also break them out by genre, or by median sales rather than mean, or by showing a distribution of software sales.
If you genuinely believe that it's unfair to break out Monster Hunter games even though the mean-median tilt on the PSP is almost entirely due to them and Crisis Core, then it ought to be doubly unfair and only half as useful to break out Nintendo consoles software sales by first-party/third-party. The fact that you do makes me wonder why mathematically (or even holistically) you feel one is valid and the other is not.