There is a school of thought that suggests the following:
"Engine for go-Brakes for slow."
The theory of which says that basically decide on your braking point for a particular corner,use your brakes to reduce to the required entry speed whilst snicking down through the gearbox so that when you release the brakes you will not only be at your desired road speed but the engine speed will be at a suitable point to provide a good drive out of the turn.
This removes the possibly greater concentration and co-ordination required,(and more long winded procedure) of changing down using the blipping method.
To present an argument for the efficiency of the method mentioned, virtually all Moto GP and WSB machines utilise a slipper clutch which largely removes the affect of engine breaking and you can clearly hear the riders making multiple downshifts as they get on the brakes going in to corners.
Therefore apart from enjoying the exhaust sound and increased noise from the motor as you blip and downshift, is there any real point to using the blipping method?