Is it permissible to obligate members of a commercial establishment to pay monthly expenses estimated at 10 dinars, despite differences in their purchases and shares, and some of them not committing to buying from the establishment? And is it permissible to deduct a percentage from "dead or semi-dead" debts from a member's subscription if they wish to withdraw?

It is not permissible to oblige a shareholder in an institution to pay ten dinars in exchange for a reduction in their purchases, because these purchases are unknown and may not exist at all, which makes the payment for an unknown item. This falls under the category of selling an existing item for a non-existent one. If the payer does not purchase from the institution, then obliging them to pay falls under the category of unjustly consuming people's wealth, based on the Almighty's saying: "And do not consume your properties among yourselves unjustly," and the Prophet's (peace be upon him) saying: "Indeed, the wealth of a person is not lawful except with his willing consent." As for deducting a portion of bad debt from a shareholder's share upon the dissolution of the company, this is the legal ruling for everyone according to their share, unless one of the partners agrees to undertake the debts.