Sorry to put aside this thread a little bit. But I think it’s important for those who are not so pleased with your profit. You have to realize That You are not selling exclusivity to a AAA studio, but a non exclusive same item for many, many people with a Low budget.
The only problem with this selling mode that does not allow modular packages for a single item is that you can only create a single generic template, and should always providing assistance and upgrade free of charge, always for the same marketplace item.
Not everyone is very active in improving or implementing your own existing assets with more functionalities, free of charge.
If you add more things like more functionalities and game modes, you gonna need then to sell it more overpriced for those who have not yet bought it and offer free of charge for those who have already bought, such thing may seem very discouraging for a seller especially for one that had a peak sales initially disproportionately greater than the number of new buyers joining every month in a straight line.
For me, the selling option for modular packages can be more interesting for those who need something more specific. Because people will buy more cheaper only the things that they need. For sellers, maybe, because it will not ever need to add new features free of charge, will encouraging him to improve more and more and more your own item. (I think “free of charge” is a demotivating factor for a developer almost never extend your item with a new functionality), staying in a comfort zone, always expecting sales increasing over a same thing forever.
About a single finalized and generic item without any expansibility possibility, as a seller, you will be able to do only two things, offer free of charge any expansibility, all this new things included into a single finalized project for those who already bought, or sell this finalized project more, much more expensive for those who have not bought yet.
About more modularity, this can help the customer looking for a specific requirements for your project, the seller because it will attract more attention to their main itens due certain new features. Exemplifying: some people are not looking for a generic shooter, like a multiplayer deathmatch game. Some peoples don’t want a deathmatch shooter only, but they want inside this same deathmatch game a fully modular and compatible RPG game.
But I do not know whether there is any legal limitation. But there are ways to solve this. 1. modularity fully compatibility with other market assets (It works too independently without main template). 2. Contract. Your item have dependencies. Seller exposes explicitly the requirements for your item operate properly very clear in your contract, in your selling page, (like DAZ 3D models in the DAZ marketplace).