Indiana is averaging 63 pts a game against ranked teams this year. With the line of +4, it also tells me that Indiana has a good shot of holding Illinois in the 60's as well. If not, a 75-61 type score also gets the cash.
Also, if you go by history it's been like 8 years since these 2 have even combined for this many points ( in regulation), and most of those years they have played twice. I think a total this high for any 2 Big Ten Teams is value regardless. If it was 133 I would have still considered playing it.