It's totally possible. The trick is to make sure you're consistent. I can't even count how many people get like 2,000 posts in just a few months only to drop off the face of the planet and never post again. If you stick with XG and make it your goal to post EVERY SINGLE DAY at least once (and once your on the site, you'll probably post more than just once), you can eventually get to 15,000+ posts.