Those are some pretty hard, though excellent, questions, Justin! I like the way that you've formatted the page for You're Going to Die Kissing Me, in that I can see what the rules of the game look like before I buy it, but I wouldn't want to play off of two image files, That gives me a nice incentive to pay for the PDF rather than just download the images and use them, but for someone who really can't afford the game, they have that option. I think for longer games it could be harder to show the full text in preview images, but in that case specifying that potential players can contact you for a copy would be fine (and seems to be pretty standard across a lot of games). I think your set up is both sensible and clever.
I do think the "you can DM me on twitter or email me for a copy" method is pretty standard across a lot of (especially longer) games. I've seen some games like Erika Shepherd's Exodus have a free plaintext version of the game, without any formatting or art, as a way to demo the game. Nora Blade has a rules lite version of her game Facade that is available for free, whereas the longer version costs $5.