But how would you manage these blogs at a time ? Many friends of mine can't manage/update their few blogs itself.. So better you create One or Two ,maximum four blogs . Then only you can increase traffic and update well.If your website is out of date then it will reduce your daily traffic even you have good search result.
Once Visited user never come again to your blog if it is not updated.
If you have many blogs then add other Authors to your Blog then they can also update your Blog. This may keep your blog live.
