Yes you can still earn an income from your site if you’re prepared to add glue to your seat and work 24/7. That said the online gambling landscape has changed a lot the last two years. Gone are the days where you can harvest traffic from link farms, directory submissions and link exchanges. Google now places special emphasis on well written content and guest blogging also helps. Being an affiliate nowadays entails a holistic approach since there are so many facets of your site you must focus on.
Hope this helps.
Good luck with your site.