If anyone wants to geek out, there's a fair bit of chatter on the volleytalk boards about it. In essence, the sentiment is that Oregon was not investing in VB to the degree one might expect (below other women's sports at Oregon - T&F, WBB, etc.).
Another factor could be the fact that even if KU was a wash from a budget standpoint, KU is likely to be in the upper half in the Big 12 compared to Oregon quite possibly being in the bottom half in the Big Ten with VB juggernauts like Nebraska, Wisconsin, Penn State, etc.