This should be changed so that low level wizards can also participate in helping each other with dungeons. There is no valid reason for preventing them to do so.
I have a Level 16 wizard that I am purposely not questing on at the moment while I gather information about gardening jewel seeds for the Wizard101 Central wiki. I fully expected that he would be able to participate in the recent Spiral Showcase event and receive the free Professor's Hoard Pack, because he had full access to Wizard City and some of Krokotopia, and was able to do Daily Assignments and all of the other requirements for the Showcase. ONLY THE TEAM UP KIOSK WAS BROKEN, and he could not be a Volunteer, either.
I believe the solution is allowing wizards who complete Derrick Blaze's quests to become Team Up Volunteers.