There's no paradox: people don't care all that much about production values. People watch Jenna Marbles because she's funny and attractive. Whether or not she frames her shots well is much less important.
Agree with you, but it saddens me that people will listen to her just because she's "attractive." She's not that good looking, she just wears a lot of makeup. I'd have a conversation with her in a bar, but since she's hundreds of miles away from me I don't have to pretend that she's interesting because I don't get anything out of it.
I put funny first for a reason - I think that's the primary reason for her popularity.