There are 5 basic mistakes bloggers make when it comes to increasing revenue and making sales.

…So let's get to it.  Blogger Tips – The 5 biggest mistakes bloggers make:    
 
Mistake #1 - Not posting on a regular, consistent Basis
You need to post and post often. If you don't you are depriving your blog of fresh, unique content.  The thing about adding content is that the search engines are constantly looking for it.  You want to 'train the search engines' so to speak to come to expect that your blog will have regular content.  Adding a piece of content every day or every other day helps ensure they make regular visits.  If the search engines can expect to find new content, they will look for it.  So update your blog on a regular and consistent basis.  Making tons of posts one week and not posting the next will mean lost readers. 

Mistake #2 – Neglecting to find Captivating & Useful Information
Adding regular content makes the search engines happy but now you need to make your visitors happy. That means you Now that you need to create content that your visitors will enjoy and find useful.  If you have high quality information on your blog, people will bookmark it, pass the information on and visit on a regular basis, increasing your traffic.

You can make your blog unique and attractive by adding interesting images or graphics.  Try asking thought provoking questions and solicit ideas. Try running contests or conduct surveys.  Ask for opinions on controversial subjects and be sure to make comments of your own when visitors add their comments. 

Mistake  #3 – Not finding the Best Keywords in Categories & Content
You must find the best keywords and use them both in your content as well as your categories.  The best and most efficient way to do this is to use a keyword tool like Wordtracker.  A good keyword tool will give you the advantage over your competitors by not only finding the best keywords people use to find your content but you'll be able to dig deeper and find the keywords and key phrases that others won't typically find.   

Use your best keywords in your category headings as well.  This can dramatically increase the visibility of your blog on search engines.

Mistake #4 – Failure to Increase Earning Potential
Learn to add content that discretely identifies your products or the products you promote.  This is effectively done by providing product reviews and/or including product keywords in your blog content. If sales are slow, try adding Google Adsense ads.  If you use WordPress there are Adsense plug-ins that make adding these ads super easy.  

Mistake #5 – Being afraid to voice your opinion
This is what makes your blog interesting, it's what gets attention, and it’s what prompts others to say what they think.  Don't always think you need to go with crowd.  Take a stance, explain why you feel the way you do and get it out there.  But don't do it on someone else's blog by responding with comments, do it on your blog.  You can reference someone else's blog but get the controversy going on your blog.