I don't care if you care or not, i'm just supplying information for those who would like to provide good feedback. I know that diet and cardio is important, but so is increasing the size of your abs by working them out regularly!
Beefing up your abs (if the muscles aren't very visible) is only going to make you look fatter.
Either way you look at it, diet and cardio should be your main priority, not beefing up your abs using heavy weights (as far as aesthetics go).