Cameron never had a six win season. His best season was his last, at 5-6.
In the modern era (i.e. years since the time when it was the Rose Bowl or nothing), IU missed out on a bowl in 1980 at 6-5, but the team was selected for a bowl with six wins in 1986 and 1990. It missed out in 1994 with six wins. Because of an unusually large number of bowl-qualifying teams in 2007, six wins wouldn't have been good enough that year, but we won seven and went bowling.
Other than Corso's team in 1980 and Mallory's in 1994, I'm not aware of any IU team in the past 40 years that had six or more wins yet didn't go bowling.
A bowl game is much more than a "money grab." Bowl appearances and bowl streaks are important, even to elite football programs. Just ask, for example, Florida State. For a program like IU, a bowl game provides exposure as a result of a nationally televised broadcast, it keeps alumni and boosters interested and engaged with an opportunity to travel somewhere {usually an attractive destination) for a football game and partying, it helps with recruiting, it's a morale booster and shot in the arm for the team and the fan base, and it comes with 15 additional practices that provide a leg up heading into the next season.
You can't credibly pooh-pooh the significance of qualifying for a bowl.