You can probably make more money from renting individual rooms but then you have to manage more individuals. If you have five or more room renters, then the property comes under the Boarding Houses Act, which has even fewer protections for tenants than the Residential Tenancy Act.
Have a look at this page on the Fair Trading website, and I suggest you read it more closely than you did the many requests on this Forum for Flatchatters to make an effort to protect their anonymity.