Maybe the photo below shows the best way for displaying long tail magazines – fringe and special interest titles where you have 2 or 3 copies in stock, high rent and the need to carry range in less space. This is from inside such a specialist magazine retailer in Hong Kong:
Maybe newsagents could establish a wall like this, but better, and promote the special interest space. It reduced real-estate costs considerable. Sure keeping the display tidy would take more time but if you ar careful about the categories covered you;re more likely to be serving a caring shopper rather than a bloke browsing car magazines while his partner is shopping.