I just saw this very funny–or is it sad?–YouTube video on how client pricing issues would get played out in real-world scenarios. My apologies in advance to those clients who understand the difference between a taco-stand taco and a filet mignon vs. those who believe they are paying for beef.
It should be said, these issues are more likely to happen with large agencies and when clients are unfamiliar with pricing structures, have not been educated appropriately about the services they are buying, or in general lack the experience or humility to succinctly acknowledge differences in expectations. This can be exacerbated when a marketing firm is too busy to develop the relationship or believes the account is too small to act as a trusted advisor.
It would be interesting to see the client-side version of this video.