I would look at revenue in terms of "tiers" as opposed the actual dollar amounts. There are obviously some schools who do more with less relative to their tier (Missouri and Oregon is a good example), and some schools that do less with more (Texas A&M, Nebraska). There comes point of diminishing returns, and there are naturally overlaps as this isn't really an exact science in terms of revenue versus expected outcomes.
GT is comfortably in the 3rd tier, and within the margins of the 2nd tier. Elite tier would easily be any school that can cross the $200 million barrier. Given that GT has less sports than some of the schools above us, you can make the argument that GT's revenue tier makes us an underachiever for at least the two major sports...though I expect that to change soon.
Bottom line is, regardless of if you're underachieving or not, it's always better to be as high on the list of revenue tiers as possible. As they say, money doesn't make life easier, it just gives you more options. What you do from there is up to you.