If the fans do it anyway, what exactly can the NCAA do about it? Penalize the Boise St player because of something his father did? Penalize the UGA players for something non-players did? This doesn't make any sense (which is probably why the NCAA is doing it).
The NCAA has long had a very strict policy regarding "gifts" to family members like this. This was one of the reasons why Maurice Clarett was thrown out of Ohio State a couple of years ago. When his mother (of marginal means) goes out and buys a $65,000 Hummer for him, you can be sure it's going to raise a lot of questions.