The Advantages of These Practices

In contrast to pure SEO, these SEM practices offer the advantage of immediacy. If you need to increase your traffic and your visibility right away, and you don't have a problem with spending a lot of money, this may be the way to go.

The Disadvantages

You knew this was coming, didn't you? Think about it this way: you've spent your time and money to bring people to your web site. What will they see when they get there? You've convinced them, at least for the moment, that your site is worth visiting, so they're expecting to find exactly the information they were seeking. Is it easy to find? Is it there at all? You only have a few seconds to convince them that your site can deliver what they want. Will your visitors, failing to find what they're looking for, click their browser's back button and try another site?
Your site has to be ready for your visitors. It needs to be written, structured, and coded in such a way that the information is clearly laid out and easy to find. If it isn't, your site will either be immediately forgotten by visitors, or worse, it will be remembered as one that fails to deliver.
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