Links per Site vs. Domain Authority

[GreenCupboards]

Here's a quaint one:

1. Posting follow links on another site helps increase one's domain authority.

2. If I post to the same site/forum with followed links each week, would my domain authority reap a domain authority increase benefit? In short, is there any domain authority benefit to continually post links to a site to which I've already posted a follow link?

[EGOL]

If I post to the same site/forum with followed links each week, would my domain authority reap a domain authority increase benefit?

I think that it would make you a spammer.

Why?  A site that allows anyone to visit every week to post links has no authority.

[GreenCupboards]

Thousand thanks!