Don't post every day
One of the best methods to kill you blog is to post every few days. Even better, if you can convince yourself that 1-2 posts per week is just fine, you are on right way to decay.
Disable comments
Maybe you haven't thought about it too much, but sometimes you must enable comments manually if you want to allow people to respond and actively participate on your blog.
Use default template
This is another great way to make your rare visitors to move along. This is unfortunately very hard to do because there are many totally free blog templates waiting for you around every Internet corner, but if you try, you can make it and ignore them all.
Make all kind of promises
Trust between you and your readers have absolutely zero importance. You can promise what ever you want, new posts on subject, free links, do-follow enabled from tomorrow, anything!
Quality is for losers
Why bother with 500+ words articles when you can get away with two sentences and one link stolen from another blog. Nobody will notice.
Social Networks are waste of time
This is probably the best way to kill your blog. If you think that social networks are waste of time and can't help you with generating traffic, well think again. Waiting for page rank and search engines traffic may become never ending story. Be active member of web communities and people will appreciate it.
Don't comment on other blogs
This is also totally unnecessary since you are helping others to have more traffic when you should do something about yourself.
Don't learn from famous bloggers
Why you should read popular blogs, when they don't visit your blog? It must be some fraud they do to force others to come back again and again. You will show them all when you become more popular in few weeks.
Ads are never enough
Great way to destroy your blog completely is to offer advertising even if you have just started with blogging and all you have is 3 posts and 2 very funny videos uploaded. Bring them all together: bidvertiser, adsense, project wonderful, private ads! More ads more money!
Ignore your readers
There is no point in answering your reader's comment, especially if it is negative one. How dare anyone to come to YOUR blog and say something like that! You should not publish that comment in the first place. Also, why bother with that stupid blog design suggestion, you make all decisions, right?