Feedburner and the Search engine optimization

I have always used search engine optimization as means of getting traffic to a site but recently i found a interesting article that dealt with feedburner etc. So i head of to feedburner to check out if I have any subscribers and alas, less than 100 subscribers. So i thought for a site that gets more than 50k visitors a month I really need to up my rss subscribers, because if you have no subscribers you have not well… Subscribers. 

Stats are a big thing on the internet, especially if you blog full time like i do. So its time to focus on a topic, I would like to ask the readers I currently have , what topic it is that they subscribe for and What topic I should choose.