What is the percentage of the profit of the online store for the developer and the seller?

Question

Partnership programs

The simplest online store, which is organized by two friends or relatives.
One person makes a website - development, design, support, development and regular updating of the product database manually.
Another person works with clients as a salesperson, and is engaged in customer acquisition, promotion and advertising.
Delivery is handled by other people.
What is a fair share of the profits for each?
All profits are divided between them.
It seems to me that it looks like an ordinary store that rents a room that the owner built.
But in my case, the landlord and the tenant are partners.

Answer 1

Another person works with clients as a salesperson, and is engaged in customer acquisition, promotion and advertising.

As I understood from the question, it is this person who generates the profit. The site is just a tool.
Therefore, he can simply hire the first one on a rate, and not on a percentage of the profits.
Moreover, updating product databases can be done automatically or through a convenient gui and get rid of the first one altogether, sometimes hiring freelancers for some improvements.

Answer 2

Depends on many factors.
If the second person does not have the money to hire a developer, he is unlikely to have the relevant experience and it may turn out that the developer is making a website, but there will be no clients.
For example, you can evaluate it like this. The first evaluates the average cost in the market for such work, the second says how much money he allocates for advertising. From this ratio, decide the shares.