We are trying to provide an experience that resembles (to the best degree that our system allows) drafting with the other players in the event
Then you should have your bots act like players in Premiere draft. There's less rare drafting there and that would more closely resemble drafting with other players.
I don't see any benefit for the players to have your bots be rare drafting. It makes it harder to read signals and harder to acquire rares for our collection (though I'm thinking that's probably the point.)
But player behavior is different in Premier and Quick drafts, in part because of the price difference. If the bots allowed players in Quick Draft to end up with all of the rares, and every deck you play against contains six or seven rare cards, that wouldn't resemble drafting with other players either.
The benefit is that it results in your draft opponents having realistic draft decks. When players change their behavior, whether by favoring certain colors or drafting rares at a drastically different rate, we try to adjust to keep things in line.