Absolutely. A decent client who sees you as a key partner in the success of whatever they want doing is absolutely worth apologising to - and they will apologi

Absolutely. A decent client who sees you as a key partner in the success of whatever they want doing is absolutely worth apologising to - and they will apologise to you too if they get things wrong. A monster of a client will never apologise to you, and you should never apologise to them. And once whatever it is you're trying to do for them is done, walk away (after having done the usual "Hassle of dealing with this client" vs. "How much of the mortgage it will pay off" dance, of course).