Dear Major,
As BenCole has outlined I am not working as a writer - I have graduated this summer and I am working now. I am simply selling old papers I wrote during my years in university.
Once again I would like to agree with BenCole: I can not see any questionable aspects in selling my old papers: I have written them myself and I can do with them whatever I want. On the other side I am sure that anyone who buys my paper knows that it has already been submitted (who would write a paper such for the sake of it?!) and would not submit it.
Having said that, I would be much more concerned about companies that write papers for students. As those papers are unique, students (in my belief) would be tempted to hand them in and this will be plagiarism.
With regard to the argument about British/American companies I would not ever use the US source either :-) as I believe that UK academic standards are significantly higher than in US. I would not comment on the price issues - I was never tempted to order anything written for me.
Daniella