My setup quality list:
A+ = I MUST take that.
A = I definitely should take that.
B+ = I'll take it.
B = worth a shot.
C+ = maybe if I get confirmation and SMT I'll think of it.
C = I'll gamble on it fuck it, who cares anyway.
D = If you take this you're retarded.
F = fk you.

A+ = 5%
A = 3%
B+ = 2%
B = 1%
C+ = 0.5%
C = 0.5%
D= not allowed to be taken.
F = not allowed to be taken.