Although I cannot say I've tried this since my products have been very niche, you could always try to come up with ten possible reasons why people might not car

Although I cannot say I've tried this since my products have been very niche, you could always try to come up with ten possible reasons why people might not care about your service, list them on a questionnaire, and then run them using an Online survey service (such as TolunaQuick or SurveyMonkey). This could aid in telling you what areas of your offer are lacking the most. It would cost at least a few hundred, but it's better done earlier than later. On a side note, be sure that your questionnaire is balanced and doesn't lead respondents to answer in the way that you want them to. Remember: The goal is to improve your product, not to pat yourself on the back. Don't let your ego get the better of you.