SanDisk Cruzer Blade 16GB write protected error

Read that less than 1% of thiese things fail?

have had a 32gb micro sdhc for a week, suddenly came up write protected?

tried all sorts of things,

eventually by loading it into a cheap camera I formatted it.

Back into PC! Write protected! 

well I got the **bleep** thing for £10, so cheap I bought two, loaded the new, unused one in, and straight away, straight out of the box… write protected!.

less than 1% eh? and why are they so cheap?