Part of the problem is (at least in my field of work) that there are so many people out there who sell an inferior service at an incredibly reduced rate, customers wonder why our consultancy work is more expensive. You get what you pay for and I have to say that a cheap service that doesn't achieve results is really not a good investment at all. Sadly, it seems a lot of customers don't see it that way. Often when customers try to knock down the price it can be useful to say, 'So what do you want to leave out then?' This refocuses the mind a little!