Forums in the Matched Betting Niche

1. The Money Shed
Forum has 11,006 members.
https://www.themoneyshed.co.uk/index.php  

2. BettorsChat
Online offshore sports betting, internet sportsbook and online gambling featured by BettorsChat.com. Daily internet articles on gaming industry, free picks, odds, list of reputable and disreputable...
http://www.bettorschat.com/forums/  

3. SportsJournalists.com
SportsJournalists.com is the Internet's most popular gathering place for journalists.
http://www.sportsjournalists.com/forum/  

4. Sportsbetting Forums
Online Sportsbooks , sports betting & offshore betting information and resources at Therx.com
http://www.therxforum.com/forum.php  

5. Football Forum - Official Message Boards
Many people go football crazy over sports forums like this one.
http://www.thefootballforum.net/  

6. Bettingadvice forum
Bettingadvice Forums
https://forum.bettingadvice.com/  

7. Trade2Win
The #1 active trading community in UK shares, US stocks, index futures, options, commodities and forex. 250K+ members and 1.6M+ posts since 2001.
http://www.trade2win.com/boards/  

8. CPFC BBS
Crystal Palace Football Club Fans Forums. News and discussion of the Eagles, South London's greatest football club.
https://www.cpfc.org/forums/  

9. Neoseeker
https://www.neoseeker.com/forums/  

10. D-Addicts
D-addicts
http://www.d-addicts.com/forum/  

11. TopGoldForum.com
https://topgoldforum.com/  

12. Antionline Forums
AntiOnline Forums - Computer security community for internet safety and trusted networks
http://www.antionline.com/forum.php