I've subscribed to RW in the past as well, as Cycling Plus, Ride (motorbikes), Running Fitness etc. The problem is that with most things there's only so much to say. Hence you get the same articles repeating. Every new year running mags feature marathon running, to catch the London marathoners. Not so good if your training for a 10k.
I think there's so much info and advice available at running clubs, on line and on forums etc, that it makes sense to buy a copy of RW/Running Fitness etc when it has something that interests you, the money you'll save on the 'off months' will more that make up for not subscribing and paying full price.
Also, old fashioned I know, but the local library is likely to have a good number of running related books or even magazines. (Assuming the ConDems haven't closed it down yet of course).