When PreCentral's people asked Palm about this, their official statement to them in part was:
The provision you've quoted explains why Palm might collect user information. For example, we collect and transmit users' email addresses, email content, contact lists, etc. to provide WebOS services such as back-up and restore for the purpose of backing up that data and helping users restore the data if needed (in that case, it would not be limited to just the email address collected at registration). If users someday make purchases on their device through the Apps Catalog, then we would also collect payment information to process the transaction.