First, a response to Donald. There are many ways to market for absolutely free. In fact, many of the free methods will work better in the long run than paid methods. So, here are a few that you might be able to use. Social media sites such as Facebook. Now, first understand that these are not places to advertise. You can include links to what you are doing, but if that is all you use them for expect your results to be dismal indeed. These are places to network with people. Build relationships. Through those relationships you can then let people know what you are doing. And building relationships is a way to keep your business going. If you have 100 sign ups and only one person stays as opposed to only 10 sign ups but all 10 staying, which would you prefer? The 10, naturally.
You could also use forum marketing. Again, not a place to advertise. Forums are a place to build relationships and provide value for the community. As you become known and as people begin to rely on you for advice and knowledge they will click on the links in your signature. Your signature is the only place to advertise in most forums, unless they include a Free Advertising section for you to use.
H. Ellis, in the post above yours, spoke about article writing. Again, a great method to drive traffic to your sites and produce sign ups. There are tons and tons of free methods for you to use, these are just a few.
Now a quick disclaimer: These methods, and virtually all marketing methods out there DO work. However, if you use them wrong then you will not get many results. There are two tricks to being successful with whatever marketing method you choose. Number one and most importantly is to take daily action. If articles are your method, then make sure to write at least 3 articles a week every week and get that content out there. Place the article on many article sites, put it on your blog, bookmark it in social bookmarking sites and let people know on your Facebook page or Twitter account that you wrote an article and link to it. A little action is no good. You want MASSIVE action. Number two and very important is to get some marketing training. This can be in the forum of books at your bookstore, e-books, videos, meeting people who know how to make money and talking with them and doing what they say. Be sure, be sure, be sure to get yourself some marketing training. To stick with the article example, there are many things about writing articles people are unaware. How to properly link, how to write resource boxes, how your title makes a HUGE difference in the response you get. There are many article marketing training tutorials and books out there. Find them and devour them. Watch other article writers and see what they are doing. Make it a point to learn how to do what it is you are doing. And then do it every day.
Hope this all made sense.
And H. Ellis, like I said above virtually all marketing methods do work. It's all in how you use them and if you use them daily. Let's stick with article writing. Be sure to write tons of articles and get them distributed. An article is like an island, alone with few visitors. You need to build bridges to those articles all across the internet. (By the way, if you want article marketing training I can point you to a video that will blow your mind, just PM me.)
My only advice is to take daily consistent action and then to get training on those methods. It sounds like you work hard, and that is definitely important. But just as important is working smart. Invest in some training materials, learn from the masters, make adjustments to what you do and then take action, massive action. Doing a lot in one method completely outweighs doing a little in dozens of methods.
Hope this helps!