Here are some features that could really upgrade profiles:
- Profile Cover
- Profile Background
- Profile Widgets / Blocks
- Audio Player with playlist.
- Profile Views
- Profile visitors
- Favorite forums
- Trophies block
- Leaderboard ranking
- Favorite tags cloud (tags most viewed/posted)
- Recent Watched content widget
- Recent Content from followed people
- Media Slider (XFMG)
- Display Profile Cover
- View Profile Cover
If the user has no permission to Display Profile Cover, then the profile Cover his hidden on their profile. No matter what permissions others have.
So when an account upgrade expires, then the account will not have a profile cover visible. Only when the user upgrades the account then the profile cover is visible again to all users that have permission to View Profile Cover.