As I've read it's not really suggested to buy these cheap "traffic packs 1000 unique hits for $10" and such .. so I've been wondering how else can I promote my gambling site? Already submitted to directories, but that's all.
This should have been planned out before the website was made but ill give you a tip. 1. Keyword research - Make sure the keyword you trying to rank for has searches every month. 2. Build backlinks - This should be none stop until you rank for your keyword. 3. Repeat steps 1 & 2 with a new keyword.
look for forums with "poker trick" like counting cards, black jack trick.. sponsor ebook of such .. place ad on those discussion forum
If you can search on Google with some effort you will find lot of your niche web links. They may be blogs, Forums or sites for playing gambling. Then try for the options if they allow you to place your website links into them. That's it! All that what you are looking starts working right from those websites! And this is not actually affiliate marketing but you can go for affiliate methods too!
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Create interesting posts on forums and use your signature to link back to your site with an enticing offer: "Find out how I win $575 every week for $50 stake", that sort of thing. If you give out something interesting in your post (create new post obviously) you'll get hundreds of views. Make dozens of posts like this on different forums and watch your traffic explode with targeted punters.
As stated before, PPC is a simple and quick way to gain traffic. It depends on if you have monetised the site well enough to create a profit off PPC, it can be as easy as that if you manage to make a reliable profit over the costs of advertising.