I think, it's not so much the Question of who controls who in general. As long as everything runs smoothly, there is a fine Balance of Power inside the Club between the Owners and the Clients. Also, you don't need every Single client to be super Powerfull. Yes you have the washed up B Movie Actor, Lucys colleague and more, that would fit better for the "local Dungeon in a Small Town/Suburb" type of Club.There are maybe 2 customers who have more power than Kathleen and or her husband. One of them is another elected official so the pissing congressmen/senator has an equal amount of power and therefore isnt as much of a threat. The other Kristoff Jameson (leader of PMC) has been friends with Chuck for decades and is unlikely to come into a place Chuck made as a playground (Kathleens words) and tell him how to run stuff. We see an example of just this when Kristoff refuses to talk in front of Edwin until Chuck introduces them. If Kristoff was the one in power he would have no need to change is behavior. While the customers are "bad" people none of them are comic super villains, only three of them being anything other than a celebrity, and only two of those 3 having the same or more power than Kathleen.
Honestly curious how you think the high school admissions guy who wants lucy, Mihir, the boob guy, and a washed up B movie actor, an obese and perhaps dangerously horny Italian singer are controlling the owners?
On the other side we have very Powerfull Clients as well. We have an High Rank Diplomat, not any Diplomat but the Ambassador himself, the Local Police Chief is also not to underestimate, with an Ambassador and Senator being present, the City the Club is in, and with that the Police Force he controls, would be rather big. And if all of this isn't enough we still have the PMC guy that practical owns a Private Army.
Yes, the mix of the clients is odd. And in my opinion, Waters down the supposed Exclusivity of the Club and it's believability and is (for me) one of the few weakpoints in the writing so far.
In the end i think the structure inside the Club is too complex as to break it simply down to an "who controls who" question. Yes there are for sure Situations inside the Club where the Owners can exert their power even to the Highranked Clients. But they should still be aware of the fact that, at least the Highranked clients, are outside of the Club evenly if not more Powerfull than they are.
As long as the Clients think they can trust the Owners to ensure the Secrecy of the Club, and that they would take action if it would be endangered, there is no need for them to involve themself more into the Club as enjoying it's Benefits. But, if this trust would be, in any way, damaged and the Owners would ignore their Clients interest, this could be the start of an "mutual annihilation war". And i think this complexity and possible fragility should be reflected by the Story and Plot.