Just read this and thought it very fitting to those assistants who are transcribers by trade. I myself am a Transcriber and found this to be very imformative. So many businesses are going for the cheaper option when it comes to this type of service and in the long run they end up paying double for the same project.
Recently I worked with a client who had files done by someone else and they were so bad she passed them on to me for editing. As soon as I opened the file it was immediately obvious that the transcriber was not a natural English speaker. Simple phases, words or even sentence structure were a mess, and large chunks of the content were omitted.
So take your skill seriously and offer the best service you can and enjoy what you do.