There is a lot to do for promoting a website: write content, fix page titles, write meta descriptions (for the people, not the search engines), add title attributes where necessary, make sure the site is search engine friendly, submit to some directories, promote the site using other techniques, etc. But does a single person has to do that?
There has been a discussion at Marketing Profs on how the marketing people call the individuals, using their products or services.
As noted, each word has its own connotation and some (like user) may be even derogatory, as it treats a person like a mindless being. On a related note, here is how people of different professions may call people:
Increasing revenue is the main concern of nearly every business (if not, it should be) and everyone seeks any ways to get an extra competitive edge. Another way of genearating income is to increase sales force efficiency.