So here is the answer...
It probably takes (maybe) twice as long to examine a bad picture as a really good one.
It takes MUCH less time to screen an excellent picture by a respected photographer than one which is obviously not going to make it. Both take less time than a marginal picture.
Reasons a bad photo takes so long:
1. It isn't fair to the photographer to reject for only one reason (if mulitple reasons are valid), then have them waste their time correcting and re-uploading, then reject for another reason. So, even if the information is complete jibberish, the photo must still be checked for level, grain, dust, exposure, sharpness, etc. etc.
2. We have an extremely harsh penalty regime in mind for persistent reuploaders (those who constantly submit the same picture after rejection without modification). So as well as checking the photo itself, it is also necessary to check the previous rejections by that photographer.
3. If the same photographer has multiple shots accepted, or in the queue, we have to examine them all and try to make a qualitative decision as to which we like best.
4. If it's marginal on one factor (darkness) but outstanding in other regards, we have to try and trade one off against the other factors.
5. If the information is completed incorrectly (or suspisciously) then we have to check the info, and either correct it or reject it.
6. Truely great photos (ones which are technically outstanding) are instant-added. This means they do not occupy the time of several screeners.
Believe me, if I see a great photo which shines in the thumbnail, and I can see all the information entered accurately and completely, then I feel a warm glow before I even click on the full-size version. Of course the full image quality is still examined, and it can be a disappointment when CMOS dust, or sharpness (or whatever) prove to be a let-down.
It is SO demoralising to see pages and pages and pages of badangle, badinfo, baddouble, etc.
So, to answer your question:
Bad pictures taken by truely lazy photographers (those who can't fill the form in properly or don't spend the time to post-process to the extent of their abilities) demoralise the screeners to the point where they become less productive and hence don't screen as many good shots.
Does that answer?
TZ Aviation - Aeropuerto de los Banditos Team Images