Strange enough it will hurt in one way and it won't hurt in another.
The SEC will have a lot of money which is good for the bean counters in the SEC. The coaches, administrators and others whose job it is to meet payroll will love it. They will have even more money to play around with.
However, a 4-8 team CFP will HURT the SEC tremendously, It will have the impact of basically jamming a lot of good/great teams into a Game of Thrones situation where only 1-2 teams can make it out. That is a lot of Alpha teams fighting for a bid.
Over time, that type setup will weaken the SEC football product. There simply are not enough wins to go around. And the less you win, the bigger the negative impact on recruiting.
As for NIL, being in the playoff will afford a kid the biggest stage to make $$$. So those CFP slots will be like gold.