i wonder how they get some interesting topics on there blogs.any suggestion how to improve ur blog even if your not good in making articles?
Setup google alerts on the niche topic, it gives you an idea what people are asking/talking about on a subject.
what if your site is about design?or games?where can i find latest and interesting news to use it as a topic?
Sorry but once again Google is your best friend Study websites on the same niche + add your personal touch
Going for ten is my humble advice because revenue from single blog won't be that much in spite of your hard work. So split your work to maximize your profit...
Having a single blog is like having a single bank account.. if there is any trouble with your only one then you are stuck. So go with more blogs... as many as you can manage and update regularly... Updating regularly is important as if having 25 blogs and out of them 23 are dead then its no good