RSOC can do pretty well in top places like the U.S. or U.K., but it really depends on how good your traffic is and how smooth your setup runs. If you're using a 2-step or 3-step process, the 2-step usually works better since it's faster and people don’t leave as quickly. But 3-step can still be okay if your visitors really want what you're offering.
RSOC works alright for search or native ads, especially if you're aiming at big countries like Canada or the UK. Just make sure your web pages follow the rules and try lots of different things, because some ad networks are really picky. If your traffic is clean and real, you might see steady earnings.