Krum are you serious about suggesting one should not wear a dearly valued or expensive top to be waxed?
Should one go to the salon in joggers in case an accident happens to them?
Lastly, if it irks you that clients moan about such silly things as wax being dropped on them, may I suggest you are getting irked about the wrong things!
I have dropped wax on a client before now, I expect most therapists have. It does happen. It's not an 'on purpose' it's an accident. And its how you deal with 'such silly things' that will be the difference in losing or retaining a client.
Why, when the fault is with the therapist, is customer service so difficult to provide ... it should be one of the cornerstones of business.