Why do you smurf?

There appear to be more smurfs running around then ever, and matches seem to be decided by which team has the most smurfs on it. Not always, but a good majority of the time. Now I would hope that Riot have a high priority to reduce the number of smurfs but this is hard to do without knowing the reason. So, why do you smurf? Is it to play with your friends? Is it because your main account was permabanned? Or is it because you have hit a wall on your main and can't progress due to the low LP gains? Post your thoughts and maybe Riot can use that information to make positive changes to encourage players to stay on their main accounts.
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