I think it may count against you. After all, the first publishing rights means that the company is the first one to distribute your work. If you have it somewhere else people can access it first, for pay or not, it's already being distributed. I know for the Renderosity Writing contest, it stated specifically that the story could not have been published anywhere else, including web sites. I doubt publishers care if it's just a draft unless it is a very rough draft (story outline or something similar.) What might work if you're trying to promote your book via the Internet is to write short stories that are peripheral to the book. Perhaps a story set in the protagonist's youth, or a story about a legend that is briefly mentioned in the book. This gives people a taste of your writing without compromising your novel's publishing potential. The above is just an opinion. 4 out of 5 doctors recommend you take it with at least 3 grains of salt whenever encountered.