There may be a few reasons for this. Some are simply out of your control so don't fret too much!
We do our best to ensure that our community consists of highly qualified candidates and rely on the crowd to rank and surface the most promising entrepreneurs. However, some entrepreneurs are passively seeking a co-founder and simply ignore all requests. Others who are actively searching may lack the courtesy of notifying you if they're just not interested. In most cases, they may not be interested simply because they didn't feel you were a good fit.
To improve the chance of eliciting a reply, try a few of the following tips:
First, be sure to personalize your message. Why do you feel that this person in particular would be a good match, especially when there are thousands of other potential candidates to consider? What unique assets or skills do you bring that complement that person?
Next, you may be due for a touch-up of your profile. In addition to completing your profile (or getting it as close to 100% as possible), make sure that you have written an insightful summary and added more skills, certifications (if applicable), and maybe even some events you frequently attend. A video, even one taken from your smartphone or webcam, will help give your profile some life and help you stand out. Make sure you've listed any real-time communication accounts to your profile such as GChat, Skype, and Facebook; knowing that you're able to connect immediately will encourage others to reach out.
Finally, don't forget you can always attend a co-founder matching event to find your co-founder in person. Check our Events page to see when the next event is coming up near you!