I've seen this topic discussed on various places around the web so i'm certaintly not the first person to discover it, but what do you make of this?!
Yes, all four of those movies have the EXACT same picture used as the DVD cover, in various stages of zoom and Photoshop enhancement. They all came out around the same time ('07-'08) but from what I gather, Babysitter Wanted (which is a kickass movie) was the originator of the image. According to some dude on IMDb (always credible!), "Babysitter Wanted had this image from 2007 at Cannes before the film was even done. The other films actually ripped from them and after further investigating, I found out Babysitter Wanted has a copyright with Library of Congress on the poster and image." So how the hell did these other movies get away with this thievery!?
Thankfully, in order to distance itself from the pack of shit flicks, Babysitter Wanted will be released on Region 1 DVD with different cover art. As far as I know, a release date has not been set but I highly recommend you Region 2'ers or region free DVD player owners pick up the R2 copy as it could be a while before we see it over here in the states.
If anyone out there can shed any more light on this situation, please let me know!