At the bottom of your posts (or whatever), have a blurb saying 'if you'd like to see more content like this, consider signing up to…' etc. If I visit your site

At the bottom of your posts (or whatever), have a blurb saying 'if you'd like to see more content like this, consider signing up to…' etc. If I visit your site and I only get halfway through the first paragraph before something pops up blocking my view, then best case I close the pop-up without reading it, and typical case I close the window entirely and go read something else. It's much faster for me to hit Cmd-W than it is for me to interact with your pop-up/lightbox at all.