I push my clients towards LED. If the customer wants to save the money and use halogen I'll usually pull out a discount to get them to go with LED. Like said above a LED system might be 10-15% higher is cost so I'll offer to meet the client in the middle. I usually figure that few hundred in profit I'm not getting will be made up when I'm not getting a warrantied service call for blown bulbs.
Why do people not respect us as they do other tradesmen? Because every Tom, Dick, and Harry doesn't think he can be a plumber or electrician!