Why did Jack shoot the card at Kanade? Answer: He was peeved that he lost in Mob-fu against her.
Seems like they are really made for each other. I wouldn't be surprised if in vol 7 someone would set up a marriage interview/engagement between the two (now with Claire out of commission is the best time). The snorring is a big minus, but Cid can just make slime earplugs. That's why I think Cid would even be somewhat ok with such an arrangement.