If we were going to pay out 60/30/10 anyway to top three finishers, it does our math for us.
If Kentucky wins it all, we have a five way tie. That's just $20 apiece.
If Connecticut wins it all, it's a three way tie. The two guys who had Connecticut and were tied for the lead could take $30 and I'd take $20. That splits it out while weighting the national champion, as breum suggested.
If Butler or VCU wins, I win outright. Then second place would be split based on who the runner up is. Kentucky would be a four way tie for second, so everyone there gets their money back. If it's connecticut, the two guys will split the $40.
Seems simple enough.