Online dating proves to be one of the best business models online. Its a ever green business model. On the Web, people pay for access: online dating services. Rather than exchanging books or CDs for cash, these sites trade on the quite powerful desire of singles to connect. So, with millions of singles going online to list their hobbies and habits in personal ads, one might assume that the space is one of the last Web frontiers where the garage dreamer can make a quick move online and stake a claim to unlimited piles of gold. Not so fast.