I think this is the better direction to go. People will use your service to improve their sites, and they'll pay (and keep paying) to get the most improvement.

I think this is the better direction to go. People will use your service to improve their sites, and they'll pay (and keep paying) to get the most improvement. I don't think additional screenshots/IFRAMEing will improve the review quality much. Getting more reviews (and higher-quality reviews, once reviewers/reviews can get feeback) is the most valuable thing. Actually second thought, the one place I can see screenshots being useful is to let people crop out a specific piece of UX for comment. Have you thought about letting review requestors add a comment to guide the review toward a specific question they're trying to ask? That could also be pay-for. Obviously the balance you have to strike to keep the site healthy is to maintain the balance of reviews owed to / owed by users. Staunch is on the right track with rebalancing the "free" tier in order to primine the "owed by" pump. You can further maintain the balance by paying reviewers (perhaps "top"/"verified" reviewers, as suggested by donutdan4114) a fraction of the income you get from subscribers to do reviews. I can see that you're drawn toward keeping the 1 for 1 simplicity, but I think it'll be hard to find other features worth paying for. PS, as an enthusiastic user of Criticue, thanks!