Mainly the games have to be rated by the ESRB, and ESRB rating are through the roof! The ESRB have shot down those claims.
“The ESRB has a reduced fee of $800 for games that have development costs under $250,000,” said ESRB spokesman Eliot Mizrachi to Kotaku.

"This would likely apply to virtually all PSP Minis.”</blockquote>

Interestingly Fieldrunners' developers' don't quite agree with this sentiment.