>>536568069
Lust Provoking Image is so that your thread does not just die with 0 replies on the catalog. If you get a free 20 responses because of people AWOOOOGAing at some anime boobs, that's more chances for an actual discussion about what you wanted to start.
The issue now is that it's oversaturated and every fucking thread on this site is like that. If I checked the current /vg/ catalog I bet more than half of the thread OPs would be like that.