If you are going to spend money on contextual advertising, sometimes known as Pay Per Click, you need to be aware that the online advertising business is a complicated affair, quite scientific in its need to understand the workings of Google’s algorithms. Before spending anything, check whether a specialised consultant like qualitytrafficsupply.com can do for you.  They can make sure that your advertising appears on sites in the right sectors that will send you quality targetted traffic and provide a much better return on investment (ROI).  You should be aware there are companies that will offer to send you 10,000 visitors but they often use spammy sources to find those visitors.  Your site could actually suffer from techniques like this, so make sure your consultant uses only ‘white hat’ techniques.