[AhmedFan2004]

On a surface level with regards to the applicants, there is always going to be some degree of regulation with regards to the types of HMs chosen.

They are always gonna need some minorities, sufficient numbers of white and/or British people, mixture of people with differing sexuality, some hot girls, etc. They will always be selecting a cast.

You're basically, to a large extent, auditioning for a certain role in the show. You might not be totally clued up on what that role is, or how closely you are going to fit that role. But that's what you're doing.

You aren't really applying as an individual, but as a categorized person. If you're a hot blonde b*tchy chick, then you will be (aware of it or not) applying for a role set by BB, which most closely resembles that.

It isn't really 'well this girl is cooler than that girl, so we'll take her, even though we've already chosen 3 other girls very similar to her.'

As Marcus said, you get on via fulfilling a 1-D role that BB were looking for. You probably aren't all that special, fascinating or unique; unless that's a component of the role you were chosen for.

The only key difference is; unlike with actors, you are pretty much that role by default and thus can just be yourself. Actors have to mould themselves into the appropriate character to play that role. But Karly will just need to be herself, Freddie as himself, etc. The character setting is automatic for BB HMs.