There is a lot of misinformation about the iPhone packages and rates. First of all, you are not required to sign up for a data package to have the phone. The only restriction is that you must have a voice package with a minimum monthly fee of $30. If your current plan already meets that requirement you don't need to change anything.
The majority of customers with the first version of the iPhone in the US used 100MB of data or less per month. The iPhone voice/data packages that Rogers offers were designed to accomodate the average user. Rogers is offering four times the average data usage in their $30 iPhone data package.
The iPhone data packages are comparable to the current Blackberry data plans offered by any Canadian wireless provider. For example the $30 iPhone data package offers 300MB of data usage, as does the Blackberry data plan.
If you require more information, it's best to contact Rogers directly for the actual facts before starting petitions.