This is true.
Signature campaigns have changed a lot.
Before the application process was first come first serve, even that's gone. That used to give many people an edge even if they were not "good quality" posters.
The whole heckling about quality and merit came up because of the health of the forum itself. A high-quality post with a signature has just as much chance of being clicked on by a paying lead as a "bad quality post". If anything, a sig spammer used to get more clicks back then.
I can tell this because I assisted in managing a few campaigns myself as a rookie (before I started managing myself) and I had access to click stats.