Who's Tried Renting By The Room?

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Years ago I lived in a mobile home (on land) and discovered that it was easy to rent rooms out in it. I netted over $8,000 per year while living in my little efficiency in the back of the home. I included all utilities in the rent, and collected weekly, or however they recieved their paychecks, just to keep it simple.

I am wondering if any of you have tried this with single family homes that have three bedrooms or more, instead of just renting the house out. I never had problems with zoning or other issues, but then mobile homes are pretty much ignored by all.

College towns are the obvious place to do this. So who's tried this, and with what results/problems/profits?