Project's budget. Customer conviction

Sorry inspired by the theme: “Website for 6000 rubles, massage in addition? Answer to one habra-user "
It just became interesting ... and how to prove to the client that high-quality design and support, for example, for $ 5000 is much better than a ready-made template for 300, for example?

How to overcome this prejudice:

that “the site costs 300 bucks,” and “5,000 bucks for a site is crazy money.”

I work for an Internet provider company and sometimes clients (legal entities) Ask a quite simple question - where can I order a site and how much does it cost ?? You tell them for example:
-Here is a site with an integrated online store and a unique design made for your needs and support, for example, for 3 months costs $ 3000.
Immediately the client provides a comparison:
“But the neighboring office made a website for $ 200 and is happy ...”

You begin to explain that it is not particularly simple, it’s not like that, and in 2 hours you got it ... but everything is already useless, the client is convinced that it can be done cheaper and doesn’t even want to understand the creation technology and the difficulties that may arise.
')
Accordingly, I repeat, probably the question! How to convince (to convince, not to sell and not to sell more expensive) in the adequacy of prices such as 2-3-4-5-6 thousand dollars. Have you encountered real problems in real situations ??? How did they prove to clients in practice? What do you think in theory ...
Let's try to talk :)

Thanks in advance for the opinions !!!