It’s a good question and one that I have a few random thoughts on (which I thought would be a good addition to the blogging for beginners series):
Diversification of Income Sources – I’ve posted many times here at ProBlogger about the wisdom of diversifying your interests in blogging and the idea of multiple blogs is central in my own approach to this. While you do need to be careful of spreading yourself too thinly (more on this below) multiple blogs has been very beneficial for me and have been one of the main reasons for my own growth of income over the past three years. My own experience is that a blog’s traffic growth usually starts fairly slowly, then goes through a growth spurt before reaching a plateau where it becomes more difficult to add new readers in great numbers. At this point starting a second blog is often one good way to increase overall traffic.
The main reason that I became a believer in diversification through multiple blogs was as a result of an experience of seeing one of my main blogs suffer in it’s ranking in Google for a six week period. It struck me in this time how easily an income based around one single successful blog could disappear and I was motivated to build other blogs (and other non blogging income streams) so that if it happened again I would not be left completely high and dry.