Depends on the co-op (if it is something like Mondragón, it wants to "seek profit" so that it can survive; credit unions "seek profit" to pay their expenses, etc) - they will all have a goal but that goal may not be cash money in the pocket; a co-op could have the goal of making a grocery store available to the community; the co-op "profits" on the difference between buying and selling, but the "profits" go to pay for labor, land, etc, and anything in excess of that (+ rainy day fund) gets rebated back.

And some co-ops are just a standard shareholder business where the shareholders are the members (credit unions are usually setup this way) so if they DO extract profit somehow or by accident, they just return it to the members. This has happened with credit unions when they unexpectedly get a windfall for some reason.