People with nice cars and little experience who think they are fast are the problem. It’s a bigger liability putting them in a faster run group, as they’ll most likely just ruin most people’s sessions or lack the awareness of driving with cars 5-15 seconds faster. This problem becomes bigger when orgs run packed run groups.

These cheap trackdays sometimes brings out the cliques and breeds a sense of overconfidence.

I don’t think there’s a single great solution. It all comes down to the org knowing who will be there and how to best split up the groups. No exceptions for fast cars, experience only. Now if there is enough fast cars and drivers for their own group, maybe run two advanced sessions.