3% Service Fee for Using my Credit Card ?

I come in regularly for Botox and the staff is always amazing.
Today I was hit with a 3% service fee for using my credit card and not happy about this at all.While i understand that credit card companies can charge this I felt blindside.
Had i known i would have come in with cash. Which is an unknown amount as I never know exactly how many units I will receive until I consult with the nurse.
Its a bad business model as it leaves little room for a practitioner to suggest additional options for me ,thus in the end it is only the office that would suffer lo$$.
The 3% is big especially if someone buys a med spa package or worse a $10,000 facelift.
I don't understand why I see tons of promotions being given here for discounts on future services to retain and build clientele when something as petty as this is being done.
I will now highly consider other medspas for my Botox that do not charge this fee.
I still give them a good rating but may not return.