I noticed this because almost all new (cheap) hardware (camera, mp3 players, usbsticks etc) nowadays are using 2.0, it's the new standard for a couple of years now already. And when I used older usb 1.1 hardware at home, it took ages tot copy data... it was one of the reasons to write off this hardware and buy newer stuff.
Maybe theoretically, but when you are on stage and want to swap your 4GB workspace, in a 15/20 minute concertbreak with the use of your laptop, this is not an option because it will take to much time to do this.
Is the underlaying hardware not fast enough to handle 2.0 and therefore they choose to use 1.1?
For me the speed it's not that important because when I've a couple of really good drumkits its good enough for me so, I'll not switch that much. And I like quality over quantity.