First, let me say that I know nothing about the authors. I'm just arguing the principle here.
Yea, why hate on people who take advantage of and mislead uninformed newcomers to the Rails community by selling them existing free software that is trivial to set up, all the while passing it off as their own?
Hmm ... I didn't get the impression that they had written Bootstrap, Stripe, or Kissmetrics. Clearly what they're selling is a tested Rails app that integrates the Stripe and Kissmetrics API libraries and provides a baseline UI based off Bootstrap.
Maybe because some people believe in honest businesses, and not ripping off end users for a quick buck.
That's where this gets destructive. Just because it's not worth the price to you doesn't mean that these people are running a dishonest, rip-off business. You ought not attack people's ethics because you don't like the value proposition of their business.
Moreover, your argument is predicated on the idea that time is worth nothing. Back in my consulting days, even if the integration of all of these things at production quality would take only one billable hour (which, incidentally, it wouldn't), the $149 would save me money.
Maybe you're a faster developer than I am or maybe you just don't bill enough. Either way, just because the price isn't justified for you, doesn't mean it couldn't be a lifesaver for someone else. Certainly doesn't mean the business is dishonest.
That said, I think I will take you up on that replicating challenge.
Awesome.