Parents, family members, friends, etc. A lot of farm kids waiting in line with plenty of access to that sort of stuff (myself and our group included).
My guess is that going forward after this KU game, heaters will be banned. This will highly discourage students from camping out, which is ultimately a relief to the department.
I figured that was probably some of it, if someone really went out and bought that stuff new just for camping out for this game it was not money well spent.
I'm a little surprised the didn't go around already and tell them not to use the heaters knowing this could happen. Being that it is on university property makes you wonder if someone had been injured or killed from it if the university would have some liability issues but I'm sure it's being looking into now and we'll see new policies come from it.