Reading the postings in different Newsgroups it becomes clear that the "I does not work for me.." statements comes from one very clear reason: not enough Traffic.

The Ability to generate targeted and low cost Traffic is crucial for the success of every internet business.
Well, what is "enough Traffic" ? Lets take some minutes to analyze the traffic needs in detail.

Lets say you would have a single business opportunity that you would like to advertise. This opportunity allows you to earn, lets say 10$ per Sale.

Furthermore you would like to earn 500$ in month from this opportunity alone. So would need 50 sales during this period.

In order to determine the number of clicks (traffic) you will need, you need to know the conversion rate of your opportunity. This rate itself will depend on how targeted your traffic is. In order to make it easy, lets assume your conversion rate is 4%, meaning that 4% of your potential buyers will purchase your product/opportunity etc.

This means that from 100 Clicks, you will get 4 sales. So you need 25 Clicks in order to make a sale (100/4). This is in fact a good conversion rate! Usually you will have such high conversions only for free stuff or by having an extremly well targeted traffic.

Considering that you wish to have 50 sales in a month, you will need thus 1250 Clicks per month. If your conversion rate would be 0.4 % instead of 4%, you would need 10 times more, 12.500 Clicks per month.

Free Advertising
So the next question would be where do you obtain such traffic.
Free Advertising One easy source of free traffic are Free Ads. Just type in Google "Free Classifieds" to find hundreds of free Ad sources.
I personally use US-Free Ads, since they are free and offer multiple helpful options, like Tracking, Add a Picture, Paypal Button and many other useful features.

Free Advertising using Free Classifieds can be a very time consuming task and the results are overestimated at the beginning. It is recommended to consider the option to buy "featured" Ads to reduce the manual effort and maximize the results.

Traffic Exchanges
An additional source of Free Traffic are Traffic Exchanges. The working principle is similar: you provide traffic (i.e. by setting an especial Website as your Homepage in the Browser) and you get back traffic from other users doing the same. Usually you get Traffic in Ratio 1:2, this means you need to provide two page views to get one free page view for your business.
This sounds simple but is very practical: lets assume you have a business selling food for pets. Obviously you are not interested to views websites related with other people trying to sell you the same. But on the other side you may be interesting to see other websites about Health&Nutrition. So you will get (=traffic exchange) Advertising from this Genre if your are interested to do so and exchange traffic for your Pet business.
So the more people use Traffic Exchanges, the more views you will get to your business. Furthermore, you will get additional page views (=traffic) by referring new customers. Most of the Traffic Exchanges Systems provide also PRO Memberships, where you get paid if someone you have referred upgrade himself to PRO.

Traffic Exchanges have also a big advantage in comparison with Pay-Per-Click engines: the "cost" of the traffic does not increase with the number of advertisers.

There are hundreds of Traffic Exchanges in the Web. I personally recommend to choose one of the "TOP 10 Traffic Exchanges" tested by TrafficHoopla.
This company performs regular tests of the most popular Traffic Exchanges systems on the Net and publish the results in their website.

Viral Increase of Traffic
I had mentioned that you can "earn" additional Traffic by referring new users to your favorit Traffic Exchange.  The interesting aspect of TrafficHoopla is that you can join several TrafficExchanges and advertise them with your unique TrafficHoopla URL.  This URL can be advertised also in your favorite Traffic Exchange programm. So the more you advertise this URL, the more people you refer to this system and thus, the more referrals you get in other Traffic Exchanges you had joined via TrafficHoopla. The result is a "Viral" increase of traffic. With some time you will have enough Traffic to advertise your Business Opportunity. Once you get enough referrals, it is recommended to join the PRO Version of your program in order to get paid and earn a 2nd stream of income.