To start with, that domain is a bad choice for a marketplace. It isn't intuitive and took me about 2 minutes to pronounce it. Let me start by asking what was the motivation behind creating that website. Hobby, side project or you're just learning website development? If your motivation lies within those above, I won't take it too seriously so just play around and see what fits. If you want to make this project to be a commercial success, I've bad news for you. It won't work.

Apart from the website being partially broken, that marketplace offers very limited options when it comes to making money. You aren't solving any relevant problem bitcointalk doesn't solve already. Maybe you'd argue the automated escrow but I rather go with someone trusted on the forum here.