The maximum is what's already in cpanel; we can't increase it just because a user asks, it'd be unfair to everyone. Bryon is also a site admin, so if he's saying you'd have to upgrade to x10Premium, then you would indeed have to upgrade to x10Premium.
Off the subject, (don't take it the wrong way) - if you've been here over a year, why was your account (hosting AND forum) just created today?