Ajax strips your LSP, it dries out the finish as well. This significantly increases the risk of a severe chip as apposed to just a knick if hit by a rock etc...
Yet, the main thread has already been mentioned, the lack of protection from waterspotting, tar which will become impossible to remove, bird droppings etching into the paint, and flat out getting dirty faster. It creates the perfect environment for your car's finish to spiral downward with various markings, contamination, and severe swirling and most notably, oxidation.
In regards to the previous post by
lecchilo, claying won't necessarily remove all wax, but it randomly compromises the LSP in areas that the clay may have come in closer contact than others, like if the clay comes in direct contact without lube, catching on the finish. Regardless, the protection has been compromised, and you are correct to suggest re-application, this is definitely a requirement.
I don't want to flame the thread owner, but..
Please, don't charge people for your service as this would be unethical business practice, whether you know it or not. You'll learn, just talk with us we'd love to give you advice.
I'm here to help!