Are you saying that in a given week that more people attend pro games and view pro games than college games? I’ll bet that college beats them in both categories, hands down.
16 games (at the most) in the NFL divides up eyeballs up much less than the 60 or so games that FBS (and ONLY FBS!) puts on each week. Just think DFW- it's a Cowboys town, but how many different universities are represented in that mix? Plus factor in the folks that never went to college.
College might beat NFL on a total basis per week, but a single game has to be in a perfect storm to match an average NFL broadcast. And I'm saying this as somebody who couldn't be more bored by what the pros put out each week.