Very much this I am glad my point was clarified so that it can be understood now.
Unfortunately I think they really wanted to have two-tiers of pricing (for some reason?), but I agree that it doesn’t really make sense here to have a personal tier.
The Marketplace is for professionals making products. There is no personal use scenario for a C++ Plugin that serializes saveGame info.
I think this is how we ended up with a “personal” license that is actually for business use despite its (bad) naming. They forced two-tiers, but this isn’t a shop where most products have any kind of personal use scenario. It probably had relevance for people printing miniatures from .STLs they got from SketchFab, but it just doesn’t work at all of Unreal Engine users.