How readily/easily do people subscribe to blogs/websites

How easy is it to get subscribers to your website or blog? I know this obviously depends on how awesome your content is and if you are giving away something for free. Do people really want to subscribe to email lists for the fantastic content or is it just for the freebie? How readily do they give their information out?
I am just trying to get an idea because I have just created my email list form and am going to start adding information to my site. The reason I ask is because I have NEVER…
How readily/easily do people subscribe to blogs/websites

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