Whenever I play freemium mobile games, I find the most satisfaction I get is trying to avoid paying for things. Which seems counterintuitive to the purposes. I may be alone in thinking this, but then I'm also alone in enjoying math games aimed at kids. As a person who gains grim satisfaction from these games, I'm also the one most strongly against their existence. Games should be fun, not a grindy chore you only enjoy when you're pretending to stick it to the man.