According to Chuck Carlton of the Dallas Morning News,
the Big 12 is looking for something in the neighborhood of $28 million from Texas A&M if it wants to leave. Which is an incredibly expensive divorce. Understandably, Texas A&M isn't looking to pay quite that much. In another tweet from the Austin American-Statesman's Kirk Bohls, the Aggies are negotiating to pay something between $10 and $15 million. Roughly half of what the conference wants.
To put it in perspective, when Nebraska left the Big 12 for the Big Ten last year, the Cornhuskers paid just over $9 million. Colorado paid about $7 million. So, as you can see, it's pretty understandable that Texas A&M isn't looking to fork over more than three times what Nebraska paid and four times what Colorado paid to leave.
LINK