Is it permissible to purchase an item for myself and include it in sales to obtain a commission percentage?

It is not possible to rule on the permissibility of participating in a marketing system and earning from it except after understanding its mechanism and conditions. It cannot be analogized to similar systems due to the multitude of such systems and their continuous renewal. Furthermore, the issue of counting goods purchased for oneself as part of sales and earning a commission on them depends on the terms of the marketing system and what it allows for the participant, knowing that this specific point is linked to the overall ruling on participating in the system.