I think that the salary the recruitment consultants quote in the job listing is almost always the top possible rate that the client (the employer) would be willing to pay for an exceptional candidate. It is more of an 'attention grabber' - the offer will always be somewhere lower in the range.
I don't see the need for false advertising with regards to salary. Perhaps when they have your details they can say - you don't have the xp's so we'd offer the lower range, but at the first phone call, before they know a thing about you they say oh, sorry the company is only paying x amount, x being several thousand lower than the lowest advertised amount.
I've also found that recruitment agents advertise jobs that don't even exist! Some sort of fishing exercise I suppose :-P. All very frustrating.