Every FBS school starts off with 100 marbles, plus 10 bonus marbles for every game on their schedule against a power conference opponent or Notre Dame
Beat your opponent at your home place or neutral site (including conference championships), take 20% of their marbles; beat your opponent at their home place, take 25% of their marbles
Fractional marbles are rounded to nearest whole number. For example, if you beat an opponent with 210 marbles at their place, you would get 25% of their 210, 52.5, which would be rounded up to 53.
If you beat an FCS opponent, you get nothing. If you lose to an FCS opponent, they get 25% of your marbles. Because FU coward.

Rankings

Marble Rank	Team	Marbles	Conference
1	Boston College	210	ACC
1	Colorado	210	Big 12
1	Georgia Tech	210	ACC
1	Louisville	210	ACC
1	Purdue	210	Big Ten
6	Alabama	200	SEC
6	Arizona State	200	Big 12
6	Arkansas	200	SEC
6	Auburn	200	SEC
6	BYU	200	Big 12
6	Baylor	200	Big 12
6	California	200	ACC
6	Cincinnati	200	Big 12
6	Clemson	200	ACC
6	Duke	200	ACC
6	Florida	200	SEC
6	Florida State	200	ACC
6	Georgia	200	SEC
6	Illinois	200	Big Ten
6	Iowa	200	Big Ten
6	Iowa State	200	Big 12
6	Kansas	200	Big 12
6	Kentucky	200	SEC
6	LSU	200	SEC
6	Maryland	200	Big Ten
6	Miami	200	ACC
6	Michigan	200	Big Ten
6	Michigan State	200	Big Ten
6	Minnesota	200	Big Ten
6	Mississippi State	200	SEC
6	Missouri	200	SEC
6	NC State	200	ACC
6	North Carolina	200	ACC
6	Northwestern	200	Big Ten
6	Notre Dame	200	FBS Independents
6	Ohio State	200	Big Ten
6	Oklahoma	200	SEC
6	Oklahoma State	200	Big 12
6	Ole Miss	200	SEC
6	Oregon	200	Big Ten
6	Pittsburgh	200	ACC
6	Rutgers	200	Big Ten
6	SMU	200	ACC
6	South Carolina	200	SEC
6	Stanford	200	ACC
6	Syracuse	200	ACC
6	TCU	200	Big 12
6	Tennessee	200	SEC
6	Texas	200	SEC
6	Texas A&M	200	SEC
6	UCF	200	Big 12
6	UCLA	200	Big Ten
6	Utah	200	Big 12
6	Vanderbilt	200	SEC
6	Virginia	200	ACC
6	Virginia Tech	200	ACC
6	Wake Forest	200	ACC
6	West Virginia	200	Big 12
6	Wisconsin	200	Big Ten
60	Arizona	190	Big 12
60	Houston	190	Big 12
60	Indiana	190	Big Ten
60	Kansas State	190	Big 12
60	Nebraska	190	Big Ten
60	Penn State	190	Big Ten
60	Texas Tech	190	Big 12
60	USC	190	Big Ten
60	Washington	190	Big Ten
69	UConn	130	FBS Independents
69	Washington State	130	Pac-12
71	Akron	120	Mid-American
71	Ball State	120	Mid-American
71	Bowling Green	120	Mid-American
71	Delaware	120	Conference USA
71	Eastern Michigan	120	Mid-American
71	Georgia Southern	120	Sun Belt
71	Hawai'i	120	Mountain West
71	Kent State	120	Mid-American
71	Louisiana Tech	120	Sun Belt
71	Miami (OH)	120	Mid-American
71	Missouri State	120	Conference USA
71	Northern Illinois	120	Mountain West
71	Oregon State	120	Pac-12
71	Tulane	120	American Athletic
71	Tulsa	120	American Athletic
71	UTEP	120	Mountain West
71	Utah State	120	Pac-12
71	Western Kentucky	120	Conference USA
89	App State	110	Sun Belt
89	Arkansas State	110	Sun Belt
89	Boise State	110	Pac-12
89	Buffalo	110	Mid-American
89	Central Michigan	110	Mid-American
89	Charlotte	110	American Athletic
89	Coastal Carolina	110	Sun Belt
89	Colorado State	110	Pac-12
89	East Carolina	110	American Athletic
89	Florida Atlantic	110	American Athletic
89	Fresno State	110	Pac-12
89	Georgia State	110	Sun Belt
89	Kennesaw State	110	Conference USA
89	Louisiana	110	Sun Belt
89	Marshall	110	Sun Belt
89	Massachusetts	110	Mid-American
89	Middle Tennessee	110	Conference USA
89	Navy	110	American Athletic
89	Nevada	110	Mountain West
89	New Mexico	110	Mountain West
89	New Mexico State	110	Conference USA
89	North Texas	110	American Athletic
89	Ohio	110	Mid-American
89	Old Dominion	110	Sun Belt
89	Rice	110	American Athletic
89	Sam Houston	110	Conference USA
89	San Diego State	110	Pac-12
89	San José State	110	Mountain West
89	South Alabama	110	Sun Belt
89	Southern Miss	110	Sun Belt
89	Temple	110	American Athletic
89	Texas State	110	Pac-12
89	Toledo	110	Mid-American
89	Troy	110	Sun Belt
89	UAB	110	American Athletic
89	UL Monroe	110	Sun Belt
89	UNLV	110	Mountain West
89	UTSA	110	American Athletic
89	Western Michigan	110	Mid-American
128	Air Force	100	Mountain West
128	Army	100	American Athletic
128	Florida International	100	Conference USA
128	Jacksonville State	100	Conference USA
128	James Madison	100	Sun Belt
128	Liberty	100	Conference USA
128	Memphis	100	American Athletic
128	North Dakota State	100	Mountain West
128	Sacramento State	100	Mid-American
128	South Florida	100	American Athletic
128	Wyoming	100	Mountain West

* FCS