Her trust in Quinn is really the biggest weakness of Sage as a character. She might not have the best intuition as far as other people are concerned, but that she just doesn't seem to realize how bad Quinn is, makes her look really, really stupid.
every single episode would be understandable, but all of them, one after the other...
There's something connecting Sage and Quinn that we don't know. What we see of Quinn doesn't really fit with the image of a sorority member, let alone a vice-president. She must be a little different off-screen, or she's done something very special that makes Sage trust her blindly.
Or maybe it'll be swept under the rug like other things, because otherwise it'd mess up parts of the story.
Speaking of Sage and the restaurant, we'll learn that she came up with the idea.
Flashback
A year ago, during a girls' night out at the HOT house, the question of the sorority's finances came up. As is often the case in such situations, all eyes turned to Sage, who might take it upon herself to ask Daddy Burke for a small college grant for her beloved daughter's sorority.
Before the idea was even formulated aloud, the bubbly redhead exclaimed:
" Bitches, with all the one-night stands I see coming out of your rooms every morning, if we made them pay, no more money problems. This house is looking more and more like a pussy buffet. "
And so it was Sage that unwittingly gave birth to the restaurant...