Those who follow Namco Bandai might have noticed their European branch stating that they thought the Wii and Nintendo DS market had "collapsed" during an interview with MCV. They stated this was partially due to bad games but also due to piracy on the two platforms, with methods such as the R4 flashcart on the Nintendo DS. However, some publishers don't exactly agree with that statement, such as Natsume.
When Gaming Union spoke with a representative from the company while demoing Lufia: Curse of the Sinistrals, they stated that they believe the Nintendo DS market isn't as affected as Namco thinks due to the difficulty in pirating games compared to system such as the PlayStation Portable, where custom firmware runs rampant.
The company also believes that customers will be more willing to buy their games instead of pirating them due to brand loyalty and loyalty to the games themselves, such as the Harvest Moon and Lufia series which have sold quite well for niche titles in the past.
While there is a slight difference due to the size of the two publishers, brand and game loyalty is something that should be noted when talking about sales and piracy --- gamers are less likely to pirate a game if they feel its worth the value of purchasing it.