Why Are Reality TV Shows So Addictive When They're So Crap?

I admit, I watch some reality TV shows. X Factor, I'm A Celeb, Britain's Got Talent.. But some shows are just ridiculous - I despise TOWIE, Made In Chelsea, Big Brother - they're just people trying their hardest to be famous - and failing in the process. But they are so popular it's unbelievable. But I think I've cracked it -
They're so popular because they're ridiculously cringey that it makes it impossible to tear your eyes away from the screen.
I'm A Celeb - you just can't stop yourself from watching those horrendous trails, no matter how sick they make you feel
X Factor - you just have to see what sort of crap this nation can churn up next. You'd think we'd seen it all already, but apparently they just keep appearing..
TOWIE - I see no real appeal, but I suppose it's the overexxagerated story lines, the utter stupidity of the people in the show.. Perhaps the appeal of feeling that you're smarter than at least the majority of Essex..

Every year these shows get worse, yet every year their ratings grow and we carry on tuning into those channels at 7 o'clock and wasting our weekends away...