Be a bit of a bugger if you dropped one down the plughole wouldn't it?
Or got mugged for your phone or lost it with one of those in it, for that matter.
I've just ordered a Sandisk 16Gb Extreme Pro SD card for my camera, it cost £25.84 and is big enough and fast enough to suit my needs.
I decided to upgrade from my current Sandisk 16Gb Extreme mostly to see if it made a difference when fast frame shooting.
200Gb would probably seem ludicrous for most folk, especially at that price.