This has been discussed ad naseam, but the short answer is that someone very high up at Russell (CEO/founder?) is a Tech grad. We are Russell's flag ship school and they pay us more than we could probably get from any other company, which would see us as a second tier priority. I don't know all the specifics, but it looks like we get about $2mil or so per year from Russell. I compared that with NC State for fun and it looks like they get significantly less than that from Adidas.
I would rather have another apparel company, as I am sure would our kids and recruits, but I don't see us changing any time soon.