I think success is going to be hard to define as a lot of websites are hobby sites (blogs, journals) or advertising a company that provides an offline service.

But sites that are designed to offer up professionally written, high quality content like Smashing Magazine and the Envato network sites (psd tuts etc., Freelance switch) are driven by ads and promoting affilate products like books, or other services that they receive a commission off of. No one would expect to make a ton of money strictly from something like Google Adsense - you usually need to directly engage with specific advertisers or get referral kickbacks on purchases from linking to other sites to start making good money from a content site.

Assume $2-$8 per 1,000 (CPM) visitors per ad if you are directly selling advertising on your site, but it will probably take awhile to get good direct advertisers. But get 5 - 10 of those, could make a couple hundred per day off of a decent site.

I run a free niche dating site that is profitable off ads only.

Generally for a site to make real money off ads it needs to get quite considerable traffic, and naturally your acquisition cost per user has to be less than the average revenue per user acquired.

AOL properties (Techcrunch, TMZ, Huffington Post, etc) are all good examples of profitable sites that are ad supported.

Something like wikianswers.com. There are a lot of websites like that. A fair amount of them are based on content created by users.

It depends what you mean by 'Money'. Can you make a $5,000 a year from ads alone on a website? Yes, you can. Can you make a decent living from a single website? Well, that's a tougher nut to crack.

Active sites that serve niche communities, so long as they have an active user base, can earn you that $5,000 a year if you're prepared to get involved in the advertising yourself - that means forget about just linking to Adsense or other pre built ad providers - and contact potential advertisers directly. Niche communities, especially when there is also a geographic limitation, can be attractive to local advertisers.

Example: a UK site / forum about learning a musical instrument could attract advertising from UK music instrument shops and web sites.

I run a similar (niche) Irish site myself, and have not had difficulty finding local advertisers who are willing to pay $1,000 a year. In most cases, if your site is popular, they will chase you for the opportunity to advertise.

But there are many sites out there that do not fully utilise their advertising potential. Community driven sites that run adsense and nothing else because it's easy, when they could make 10-20 times as much by taking direct control of the ads (but that involves work, so they don't bother).

Traffic (Sell them cheap and easy) -> Convert them to community (and use them for more crowdsourcing) -> Add additional layers to it ...

If you have community and traffic, you can make real good money.

Use following points:

1: Social Connect

2: MObile connect

(This will give lead over all the other people)

Google doesn't sell ads, Google is a market place for knowledge and services and thus they make money ... be the market place to earn more.

Aji Issac, CEO, TechShu - ROI focused End to End Digital Marketing Partner