Hide Upgrade Text When Only One Subscription

I'm currently using Membership for a new site that I'm working on. The site only contains one subscription option. What I would like to do is hide the upgrade prompt when viewing the subscriptions page for a user who is already subscribed. Is there a way to do this without hacking core files?

I realize I could do it using CSS, but am wondering if there's a way to just not have it output the content period.

Thanks!