You've tweaked my interest, but I have no idea what you're actually trying to accomplish. It seems like you're adding a ton of overhead work for a performance loss.

If you only have 1 physical disk, you're splitting the I/O reads and writes over 1 spindle. If you have 3 disks in a raid setup, the you can split the O/I over 3 spindles. 50 virtual disk sitting on one physical drive still only have 1 spindle to do I/O over.