If you read Apple's motion, they are actually quite upfront about it:
"A determination that the Developers are not permitted to use Apple’s licensed products and services will significantly diminish the value of Apple’s license rights, impair its relationships with the Developers, and lead to loss of significant revenue from all developers. In fact, the mere allegation of the same significantly threatens to diminish Apple’s rights and those relationships. Moreover, Apple’s rights will not be adequately protected by the current defendants in this case, because Lodsys has chosen to assert these claims against Developers who are individuals or small entities with far fewer resources than Apple and who lack the technical information, ability, and incentive to adequately protect Apple’s rights under its license agreement."
"A determination that the Developers are not permitted to use Apple’s licensed products and services will significantly diminish the value of Apple’s license rights, impair its relationships with the Developers, and lead to loss of significant revenue from all developers. In fact, the mere allegation of the same significantly threatens to diminish Apple’s rights and those relationships. Moreover, Apple’s rights will not be adequately protected by the current defendants in this case, because Lodsys has chosen to assert these claims against Developers who are individuals or small entities with far fewer resources than Apple and who lack the technical information, ability, and incentive to adequately protect Apple’s rights under its license agreement."