This isn't shopping for pants. You want people to sign up and stick around, not just read what they wanted to read and then hit the road. If you have quality and they see that, they'll be likely to come back for more.
And the 25 page views was just a number that I threw out there, it should be something that is configurable in the admin. And if someone wants to tackle this, just let me know the cost and I will pay $$$.
The main question is how to distinguish one guest from another.
You can use the user agent + ip + some brouser options, but these data somewhere to store. That is, the load on the database or cache. If you want to hide the content, it is better to close the theme from the guests. Otherwise released a difficult decision not serious issue. All can be, but not always necessary.