Valuestrings WE 12-53 : Value for money

I use these strings on my dreadnought. They are fantastic when they are new, they sound great for about 10 hours of hard playing time after which they do noticeably start to deteriorate. I bought 10 packs of these and was changing them every week, but when I plugged into my pickup, I found that only the lowest four strings were amplified. I gave a set to a friend and he reported the same problem (He only realised when he was playing a gig and someone in the pub told him they couldn't hear his B and High E strings!) I will continue to buy these strings as they are excellent value for money, however I will only use them on guitars without a pickup now that I know they don't work, they will be fine for my little parlour guitar and just sitting round the house.