20,000 users in a week - Jetstrap HN Front Page Stats
blog.jetstrap.com
blog.jetstrap.com
I think $20-30 is in the agreeable range of what designers with paying clients will pay for things.
However, I think you can go higher if you emphasized the pain that something like this solves and how it can shave hours of time off the setting up a new bootstrap-based design - the cost can be subsidized by the account owner's clients.
If I were you, I'd look at the data you have now (your current users) and see how you could segment them into customers (Hobbyists, Freelancers, Agencies) and charge accordingly (for example, $19, $99, $249.) Thinking outloud.... but higher tiers could allow for multiple users and even client roles per account, along with restricted features that the lower tiers wouldn't have.
Some users will pay less, some will pay more, you want a pricing scheme that allows them to do that.
edit: This might just be because you're in beta and haven't settled on a price though.
Also had two techcrunch posts about something I made (http://venturecrapital.us) running on a single micro ec2. tornado + nginx + mongodb and proper indexes go a long way. Similar traffic.
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How well do signups from HN correlate with actual paying customers? I recall a blog post from several years ago that concluded there were 10,000 people who would sign up for anything if it was featured on top tech aggregators.
I don't know if there's anything you can do about people as dumb as I am. ;)
That said, there is a lot of deception going on with "coming soon" pages. Not from your team though.
http://blog.jetstrap.com/sample-page/
it's accessible from the footer - SAMPLE PAGE link.