
From an outsider's POV (I don't breed or show), the first question that came to my mind is: what's the point?
You would like a pup, but you'd only get to see him at shows; what if she doesn't go to many?
You'd be paying 50% of everything for a dog you rarely see and don't get to enjoy outside of a show - you're missing the walks, the play, the training, the special moments. So, what's the point?
Now, I do co-own a dog - my own puppy is co-owned with a friend. She pays the insurance, I pay everything else and Willow lives with me. But we did it with her best interests in mind - she's a rescue, she's had a rough start and despite trying to find the right home for her, the right one didn't surface and she was showing signs of becoming a very nervous, reactive dog indeed without just the right handling. So we talked it over and came to our current arrangement, so that Willow would have the best start in the circumstances and she's turning into quite the confident little madam :-D But, I get to enjoy the growing, playing, training, walks etc and my friend gets to see her at least once a week and enjoy her too (she would like to have kept her but her current dogs were very stressed by her).