The purchase of 1990s publisher Valiant Comics intellectual property in 2005, the announcement of the return of Valiant Comics in 2007, and the return to regular publishing in 2012 had impacts on the number of CGC submissions for 1990s Valiant Comics. The chart below shows the percentages of all 1990s Valiant Comics submission by the date they were submitted to CGC.
The above chart for Valiant Comics should be compared to the percentages for all 1990s comic books submitted to CGC to see the differences specific to the Valiant titles.
Though the announcements in 2005 certainly impacted CGC submissions for 1990s Valiant Comics more than the average for other 1990s comics, it should be noted that Valiant Comics (published by Valiant Entertainment, Inc.) announced an investment from DMG for publications and movies in March 2015. The increases in CGC submissions beginning in 2015 for Valiant, even above the overall 1990s percentages, are likely attributed to that announcement. In the fall of 2016, Valiant announced a web-based live action series beginning in 2017.
The impact of comic book based movies on the back issue comic market is undeniable, but is it also quantifiable?
In the case of the first comic book appearance of Harley Quinn, the number of CGC submissions for Batman Adventures #12 (1993) is shown on the chart below by the take of the CGC census. Though most CGC census updates were weekly, beginning around 2013, there were cases where the census may not have been updated one week and the next week may actually be the counts for two weeks, such as the gap visible just before January 2016.
The Suicide Squad (2016) was announced with a director in September 2014 and casting in October 2014. The number of CGC submissions spikes initially in late-2013, and increases significantly beginning in early 2015. The dates reflected are the CGC census updates, so it can be assumed that the books were submitted 4 to 8 weeks prior to being recorded on the census after grading, coinciding with the September-October 2014 announcements.