blocking users from switch to paid style

[ohadpartuck]

hi,
I have notices that my users can switch styles from regular to VIP style( a paid style with no advertisment) simply by add the ?styleid=5 to the url .
How can I block this option?

[AusPhotography]

You can't without doing some hacking

[ohadpartuck]

like what? where exactly?

[dougdirac]

You should filter ads on the usergroup level.