Why are the Cowboys only -3.5

[Balco10]

I know they don't blow out teams, but this line is plain teasing me to take the Boys here...
Even if I buy the hook I should think I am golden, but Las Vegas has the best of me on
Sundays!

[D3 Mighty Ducks]

Because the Cards are gonna win that's why

[Ambition]

This line is very teasing but, I got it at -4 1/2 with my bookie so I don't know if I can do it.

Too many people say Zona can pull it out..