1. Forums are well cached by search engines.
2. You can control Anchor Text/URL factor effectively.
3. You can use deep links in forums without any issue.

Of course, the main benefit of forum posting is traffic.

Benefits of forum posting are:-
1.Forum posting is the greatest way of achieving back links.
2.Forum links allows you to boost related keywords of your website so that the ranking for the website goes high in the search engine's position.
3.Also forum posting helps in bringing more organic traffic.

do follow forum provide you quality back links and more traffics. Forum helpful for online business.