My understanding is the choke simply does what it "says on the tin" e.g. chokes / cuts the air and thus richens the air/fuel mixture, enabling you to start the bike when cold.
As others have said, I add enough choke to get it started, then adjust it to keep the revs at roughly idle (perhaps slightly higher) until it'll run without.
Running the choke unnecessarily will foul the plugs as per running rich, which is basically what you're doing.
PS I'm not a fan of blipping the throttle on a cold bike myself - it annoys the neighbours. Plus, don't those MotoGP/WSBK boys rebuild their engines after every race?