what's the deal?

No joint parties for 3 reasons:
1. Im pretty sure, their national bylaws don't allow them to have joint events with other fraternities.
2.Because kappa sig probably doesnt want to party with other guys. I go to their events/blocks all the time and they are very packed as it stands.
3. Fights and brawls would break out, 100%, (see reason #2). Remember the recent TKE/Sig Chi fight that sent people to the hospital??? Yeah.

As far as campus-wide consensus goes, just go to one of their blocks. It's packed, fun, and full of good looking girls. The only other block that competes, from what I've seen this year, is Phi Psi's. Can't really argue against them being top tier anymore.

Remember the last joint fraternity event that occurred? Multiple people with broken bones, beat up, and sent to the hospital. I swear 2 frats were very close to getting kicked off campus.

Seems like a good reason to avoid joint events.