Unless your product is making people money, you need a strong argument so that people subscribe to your product. To show you the effect, offer two products: One free and the other cost as little as $9. Post the product (can be any crap) on a forum and watch the downloads/buy.
People are curious about products, but they are very unlikely to pay. They are serious about money. BUT for a _good reason_, they'll pay. Find that good reason, find the targeted audience, build the reason and they'll come and pay.