Sketchy business? Are you supposed to tip the owner?

So there's a spa I go to for my lashes and brows. The owner and her husband have not hired other people they work themselves. I did a membership contract for 150/month flat rate. Today, the owner says to me we are required now to charge a 20% gratuity after our service. I told her I had a membership and that it was not included in writing or in my contact to pay 20% gratuity to the owner on top of my members. She said omg I'm sorry, I must've forgotten to send the new contract." I know we sent it out must've accident skipped you.

Long story short I checked their website and it says "gratuity for all services will be 20% to show our team members you appreciate their work". She's not a team member she's an owner. Hmmm 🤔 💭
Sketchy business? Are you supposed to tip the owner?
No, you're not supposed to tip an owner
Yes you tip owners
Depends
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Sketchy business? Are you supposed to tip the owner?
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