Why does the DS hacking suffer as much as the PSP?

[TWRoO]

DS/Wii/360 - easy to pirate.... sell craploads of games anyway.

PSP - easy to pirate.... sells hardly any games.

PS3 - incredibly difficult to pirate.... sells mediocre amounts of games.

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Also PS2... easy to pirate, sold immense craploads of games (not so much anymore though)