The litmus test is not how many people you can get to read your blog. It's whether you're teaching people how to do something that you can sell a solution to them later:
OP: "Are you teaching anyone who looks like someone who would buy what you intend on selling? If not, why not?"
This is a test that is a necessary, but not sufficient condition for the validity of an idea. If you pass this test, you don't yet know if this is a good idea. But if you fail this test, then you defn know it's a bad idea. The value of this test is that it's easy to setup, and relies on your actions, rather than what you tell yourself--which is more truthful. Sometimes ideas are bad, not because they're intrinsically bad, but because they're a bad fit for you, which is a good thing to test for.
And context of all advice matters. This only applies to ideas that are movements, not powder kegs or empires (via gabriel weinberg) http://www.gabrielweinberg.com/blog/2010/02/are-you-building...
The worst thing is to get into a market and realize you really can't get excited about your customers' issues. Better to discover that about yourself earlier.
We got a lot of sign ups, but upon release 3 months later that same level of interest isn't there. Even after sending out invites.
What's suggested after the whole test your idea via a landing page doesn't work out?
With pre-orders you have people that have given the ultimate commitment and you can offer them a discount and/or the ability to help shape the product through it's development.
A simple billing page with something like Stripe checkout (https://stripe.com/docs/checkout) will help you filter out the tire kickers and attract people with a burning need for your product/service.
>>Want to start a website matching up job seekers with employers? Start a blog with tips for finding a new job or new employees.
Just in time advice for me. I launched last week Jobrupt, a web site to help certain types of job seekers/recruiters when people are reserved to make the first step. I must immediately start blogging.
The problem of duplicate links in HN needs to be solved soon.