I'm curious when this ostensible "home field advantage" in terms of fan ratio existed? Everyone points to the 2009 Utah game that broke all records, but forget that the rest of the season were solidly in the 30,000 range (New Mexico was the only other game that broke 40,000). In 2010, our "best season ever", you could literally walk in to the stadium for free with an expired year old Student ID and sit in the student section. Any advantage we had in that era wasn't a function of seating or season tickets, it was a function of being 600 miles away from our nearest conference mate and nobody traveled to see us, so most of the fans were local Frog fans. When we did have a big nonconference game against a local opponent, the stadium looked much the same as it does today. 2006 Tech was a good example of this.
Meanwhile, after the renovation, when we are winning games the Frog fans show up in droves. 2014 Kansas State, which in my eyes is neck and neck with the Utah game for atmosphere during the Patterson era, is the perfect example. See also 2015 WVU and Baylor, or most of the 2017 season. Yeah, people from OU, Texas, and Tech buy more tickets than people from UNLV, Wyoming, and San Diego State (and you are kidding yourself if you don't think the same seats would be available to them under the old configuration), but beyond that the atmosphere has far more to do with our fan base than anyone else buying the tickets.
(I do wish they'd fix the lower west bowl though. I'll never understand what happened there).