Recruiting kids to farming country is hard. It's not like recruiting to southern california.
As for the data, here's a non-paywalled link for the 2018-2019 numbers before Covid:
.
247sports.com
Nebraska ranked outside the top 20 in revenue. Above them just in the B10, Michigan, Ohio State, Penn State, Wisconsin, Iowa, and Michigan State
Or we could go by the WSJ value rankings:
graphics.wsj.com
Where Nebraska does crack the top 15 at #15, but falls behind Michigan, Ohio State, Penn State and Wisconsin in the B10; and is only slightly ahead of Iowa and Michigan State.
So like I keep saying Nebraska's peak at this point in history is that of which Michigan State/Wisconsin/Iowa have been hitting recently. Which isn't necessarily a bad thing, but it's no where near what Nebraska was in the 90's. Much like Michigan State won't ever repeat what they did in the 50's and 60's, I don't think Nebraska will ever come close to what they did in the 90's. Nebraska should be better than all of those teams based on being a "blue Blood" but so far have yet to show they can actually use the name to recruit better than that.