Heh. I'll pay a few karma to crack necessary wise. What else can you buy with it, right? It is interesting that so much info is lost by only displaying the net, though. A comment with zero activity is indistinguishable from one with 100+ and 100-. I'd be more interested in "most controversial" than "most net upvotes" given the choice. Not a big deal, though. Simpler is probably better.

Edit: added 2nd "net"