I feel like writing an essay about this.
EQD in my experience has always had a very questionable relationship with video makers. They do enjoy the high end content because obviously it gives them something cool to post which keeps people coming back to their blog, but they developed a habit soon after becoming the 'go to' place for content of rejecting the lower quality PMVs because they only wanted "The Best" content.
That started pissing off a lot of people. I remember a result of that being a post by Cereal Velocity where he was talking about simple PMVs and said: "Simple though they may be, they're still first class citizens here at EQD."
which was said because of some of the angry emails they were getting from their selection/rejection process. That whole ordeal led them to start up the simple PMV posts as way to keep up with the sheer amount of content being sent in.
This on paper sounds like a good idea and you can't say that they at least didn't try to find a solution that pleased everyone, but what it also did was start labeling which content was seen as important and which wasn't. This type of separation directly impacted a lot of attention for videos and in some cases robbed videos of getting attention that they deserved. (Some videos such as The Stars Will Aid In Her Escape, which was thrown in to a regular post, were thankfully exceptions to this.) Once they started labeling these sections with tiers, people would skip out on the Simple PMV posts simply because being associated with that name meant that EQD considered it to a lesser quality video.
The other problem with it is that they simply just dump a ton of PMVs into the one post and leave it at that. You know that EQD isn't watching every single video sent to them all the way through and neither will anyone else when there's more than 5 in a post, much less 10!
On the flip side, all of this treatment pushed people harder to make better videos just so they could get their content a better chance of being highlighted (This happened to me as well)
We're still in that system but things are changing for the slight better. The highest amount of traffic for EQD was in summer of 2012 around BronyCon and since then, a number of sources have cited the amount of people visiting to be steadily dropping. Right now the traffic is half what it used to be. They also don't get as much content sent to them, and they now have other websites doing dedicated PMV posting (such as this one and Everfree.net) to compete with. As a result, and I've noticed this a lot ever since I began PMV posting on Everfree.net, they're being less picky about content, and giving more single posts out to videos they wouldn't have given otherwise.
In the end, I think they do recognize the impact and appeal of PMVs but they have nobody who truly cares about them or understands how much work it takes to make them. As a result, their choice of what gets more attention can sometimes be very questionable and not make a whole lot of sense to the rest of us who know a lot more about them.
It'd be nice if they had at least one dedicated person to do PMV posting but the chances of that happening don't seem likely. It's disappointing because they have pre readers for fanfiction, and from what I've heard, a group of musicians who vote on the music side of things for what gets highlighted. Maybe they don't intend to treat PMVs the way they do, but not giving videos the same benefits and expertise that the other sections get still often leaves them treating videos like a 2nd class part of their site, despite their track record of having the potential to be just as popular if not more than music, fan fiction, and underwater pony basket weaving. (Among other things)