Except for racing, I have never believed in turbocharged or supercharged engines. Just increase the engine displacement. Forced induction puts a lot more stress on all engine parts, and causes them to wear out/break faster than a normally aspirated engine. Plus you have all that additional complication, more stuff to fail.
I've always been a hot rodder (cars) and know a lot of people with superchargers on their engines. But the engine has to be built from the ground up with aftermarket parts to handle the extra power. Many of these cars are never raced, so the supercharger is basically just for show. The additional power rarely gets used.
I race a normally aspirated small block Chevy 383 (350 block, 400 crank) that I built from the ground up with expensive parts. I use one 4 barrel carburetor. For what the engine cost, I could have easily built something with more power, but I chose to spend my money on durability instead, since I race only for fun, and can't afford to keep rebuilding engines.
I never understood the power thing with sportbikes. Sportbikes are ridden on the street, and a Ninja 250 (which I have owned) can cost you your license if you push it. More power means a bigger, heavier bike, which is harder to handle, and has way more power than you can ever use on the street. Real roadracers, which supersport bikes are patterned after are super expensive, and super lightweight for the power they produce. They are hand built out of exotic materials to make them light, something you can't do with a production bike. Plus you can ride 150+ mph on the track, but not on the street. Not for very long anyway.