You can look at the 2023 Knight Report Data.

The Current 16 SEC schools (including Oklahoma and Texas, but not Vandy since they're private and don't report) averaged $58.5M in media revenue.
The 6 remaining (non-private) Big 12 schools averaged $47.7M in media revenue.

So that's $10M less per school... which isn't nothing.  But those SEC schools averaged $189.9M in total revenue, where the Big 12 remnants averaged $120.2M, meaning the overall gap was near $70M per school.  

And the reason was that the SEC schools averaged

• $20.3M (108.6%) more in ticket revenue ($39.0M to $18.7M) 
• $18.7M (53.0%) more in donor revenue ($54.1M to $35.3M)
• $10.8M (22.6%) more in media revenue ($58.5M to $47.7M)
• $8.7M (103.7%) more in corporate revenue ($17.1M to $8.4M)
• $3.3M (174.5%) more in government/institutional support ($5.2M to $1.9M)
• $7.9M (96.4%) more in 'other' revenue ($16.1M to $8.2M)

Other is sports camps, concessions, parking, student fees etc.

So of that $69.7M difference per school... $58.9M of it (84.5%) comes from the random people and fans associated with the program.  It's just people and fans spending more on tickets or suites or concessions or just directly donating money.

So the question of "How do we compete with SEC teams?" isn't "Well it's impossible, because the networks give them so more money".  It's "We as a fanbase need to find an extra $60M per year to support the program"