Ask HN: Feedback on an idea

So I'm planning out this website/app that takes in (content) submissions from the audience. Now, I want everything to be as simple and uncomplicated both for me and the users.

Here's the deal: I don't want spammers (who does?). I don't want to bother building an anti-spam system/adapting an existing one, as it will probably result in being more complicated than the site itself.

I also thought about approving submissions myself, but figured that, though it would be easy at first with few submissions, it would be a pain if it picks up, and I would probably end up building a submission management system which would, again, result in it being more complicated than the site itself.

Then, it occurred to me that I could set up a pay wall. Now, the motivation of those who submit is that they actually get something in return, something that can result a bit pricey elsewhere compared to what my pay wall would be: from cents to maybe $1+ if the site picks up.

I figured it would be a nice way of both preventing spammers and making some pocket change for a couple of beers every now and then. What do you think?