So, basically sue threat for a 5Euro more in comission, based on the premise that a cooperator won't be able to ask for a raise or quit? If there is an agreement stating that, it is abusive and favorizes only one side of the deal.
Or lawsuit is concering 'possible profit loss' over the chips bought in 1000pcs quantity?
Dunno what to think about it, it is so sad, but asking for a raise is not an uncommon and bad practice, and most mature people negotiate conflicts, don't sue right away.