I went and took a quick look at your site. While I won't pretend to know your user base, the value proposition and messaging doesn't seem to be that strong. The site starts with > "Ridden by evil entrepreneurs and people who follow their dreams.We know, that's wierd. You were warned."
Despite the obvious typo, its not very clear to me what you do. I know word of mouth might be what has brought you traction thus far, but apart from that I couldn't imagine myself signing up if I just landed on that page.
There is certainly merit to the idea of bringing entrepreneurial people together, but you aren't without significant competition, and you aren't in a space that has yet discovered a viable business model. I'd take a long hard look at your overall strategy and market approach before investing heavily in the same direction.