there's a great wee animation about clients wanting work for free somewhere...
it's the same in all trades - you tend to get what you pay for*
you can get a site for £50 i'm sure. some clients wont understand what the difference between a £50 and £5000 website is.
showing a client the difference is part of the job. if after explanation they still want the £50 website... fine. i'll just get me coat.
*apart from in the fashion and technology industries where they use Vietnamese slaves.