Paid levels - I just can't get it

Hi folks!
I try do configure paid levels module. I want to enable standard members to become supporting members by subscribing for a one-year-membership. Set up the new level with extended permissions for those supporting members and configured payment mod.
But, why on earth, now all of my other (hierarchical higher) membership levels get this button for upgrading on their profile pages, as well? (Please see attached pic.) I am the admin and I have some moderators, who help me with proofing member generated content. Why should those moderators pay for a membership? Does paid levels mod not refer to the hierarchy of membership levels? And where is the option to exclude helping members like moderators or myself from paying (for working voluntary)?

I was shure to find something on that topic from other community members in the search, because that is a normal usecase for NPOs, like us. But I couldn't. You start as a standard non-paying member, you commit yourself to the goals of the NPO and then you decide to become a paying member, in order to support the organization. Other members help with their expertise and time running the community. They should not be charged a membership fee. But maybe, I'm doing something wrong with the configuration of paid levels mod?
Cheers, thomlin