As long as people who choose or prefer to work this way are not breaking any rules (and this includes charging outrageous prices), I honestly see no problem because people are free to express themselves as they please and use other people's writing to do so is acceptable.
However, once again I reinforce the idea that there must be full agreement between the parties on what is on the table.
For me, the ghostwriter was a real find. I am a student and we are assigned a lot of writing assignments. Therefore, I have to ask academicghostwriter.org for help. And honestly speaking I am glad that I found a helper for me, otherwise I could have been expelled already.