I agree with you, however... my free samples for prospective clients are merely examples of the quality of my work and do not, in any way, define the direction in which the paper will go. I enjoy researching topics and hope to provide my clients with some assurance that I have both the ability to understand, as well as, write a cohesive paper about their subject of choice.

I think that one way of ensuring that a company is not going to scam you is by requesting a free, short writing sample. This could be, for example, a brief introductory paragraph specific to the subject you need them to write about. If they are willing to make the effort to do a little research on the topic and write a few sentences, you are more likely to be dealing with a conscientious writer. I offer this service to all my first time clients, and I feel that this puts them at ease.