Does it have unique content?
Does it have a reason for visitors to be there?
If you answered no to either of these, don't bother. I see this time and time again; people see a nice site bringing in $$$ through a unique idea and produce a clone that doesn't work as well and doesn't have the original and unique content in the hope that they'll make back whatever they've spent on it and profit. It's useless, you can throw as much advertising you want at it, without unique content and a reason for visitors to be there you won't make anything.
This is my main gripe with the 'webmasterworld', people are under the illusion that if you pay $100 for SEO and $100 on adwords you'll get a popular site, then there's the people who think that starting up a blog on a domain will instantly get the money rolling in, none of this works;
1. Unique content.
2. Content that users want to see/read.
3. Make the user experience awesome.
4. Don't stuff your pages with adverts, building a website should never be about the money, it should be about accomplishment and helping people understand about what you enjoy.
5. Keep the content flowing, find out what the users of your site want and give them it, they'll reward you.
6. Throwing money at a site is never the way to go, google ads, unless you're selling a product everyone wants, will never succeed compared to viral advertising. Take 'the lonely island' group for example, they built awareness of their album by creating something they knew would be a viral hit, they didn't have to pay for horrible little google ads or flashy banners that pop up on myspace layout sites, they had free advertising because their content was worth watching.
Please, create websites because you're passionate about the subject and want to offer something to people, don't do it because you're desperate for money, it's destroying the internet. I, as I'm sure many other people do, bookmark a website, or subscribe if I enjoy the content and want to see more, the sign of your website being worthless is when you're paying people to subscribe to your RSS feeds or become a member and post on your generic forums.
I hate to see what the internet has become, I'm fine with people making money through their own creativeness and talent, but creating worthless websites really annoys me, beyond comprehensibility.