70% on a small number of games wagered is doable. It is not doable over the course of a season unless you wager on a significantly small number of games. My best is around 66%. Part of my game plan is to wager on the "Games of the year" which can be very profitable IF you are capable of getting a real good read on about 50 teams before the wagering opens, usually on the 2nd Friday in June. If you can come up with a line on the big games and then compare them to the opening lines when the GOY's come out, you can make a good score. Usually I operate with at least 4 other people because of the restrictions put on the number and amount of wagers you can place before going back to the end of the line.
I tend to concentrate on the Power 5 conferences, though I will look at every game. I wager on about 100 games per year, including bowl games. It averages out to about 4 games a week, which is a small number compared to some of the guys in here who have to have action on any game on T.V. Televised College games average about 40 a calendar week, when you take into consideration all of the regionally televised games. That is a lot of games. I also rather wager big amounts on a few games than small amounts on many games. The absolute unquestioned fact about wagering is this. The higher the number of games that you wager on, the more likely you will end up around the 50% mark fir a W/L record, and as we all know, 50% is a loser. I also NEVER chase bad money. My wagers are basically for the same amount. To me, the game is either worth wagering or it is not.