to put it in perspective - senior PR consultants can and do charge between UK250 and 650 depending on the situation. Esp in London and New York. I sometimes get the guilts over charging a client $400 an hour to help them manage crises but then realise that a) I have a rare skill that they need and b) that if they don't want to pay that then they don't have to. Plus the money I earn for my company helps pay x number of salaries, support x number of families, x number of local sandwish shops benefit etc.
So although PR is a fairly pond-scummy job at times its also helping companies, governments and organisations get the attention of people for products, services, campaigns that drive either the sales, or uptake of pap smears, or donations to a hospital.
The least defensible is the product/sales - except that by making sure customer x's software is the well-known and has a good reputation I encourage people to buy it which, given company x has set up software development in Bangalore, is helping build the Indian economy AND helping company y reduce admin overhead by 10% which means they don't need to reduce headcount this year...
which is a lengthy way of saying that imho even the economy has its own organic nature