She says that "...the number of subscriptions to your blog has an impact on how many times your blog comes up in searches".
I did some research and found the following on Google:
Since Blog Search indexes blogs by their site feeds, it will only include items that have been posted since it started indexing a given blog.
Blog Search indexes blogs by their site feeds, which will be checked frequently for new content. This means that Blog Search results for a given blog will update with new content much faster than standard web searches. Also, because of the structured data within site feeds, it is possible to find precise posts and date ranges with much greater accuracy.
What is the Google Blog Search Pinging Service?
The Google Blog Search Pinging Service is a way to inform Google Blog Search of weblog updates. These updates are then published and shared with other search engines to allow them to discover the changes to your weblogs. In addition, Google Blog Search will add submitted weblogs to the list of blogs it needs to crawl and index.
The Google Blog Search Pinging Service is for bloggers who wish to have their blogs crawled by Google and have them updated in Google Blog Search. It is also for blogging services that wish to provide the service to their blog writers. Google currently monitors other pinging services and will continue to do that. However pinging Google directly will potentially reduce latency when crawling your blogs.
If your blog has recently changed and you would like Google to crawl it please submit your blog URL here. Since this service is a one time notification service, every time your blog changes please submit your blog again.
You should ping as often as your blog changes. If you wish to use our API to make this automatic, please take a look at our API here.This does seem to mean that the more subscriptions a blog has then you will get recognized every time someone gets a feed from your blog.
So if we all subscribe to each others blog we will all benefit and get our names out there!
Have fun blogging and subscribing!