Regarding your other point - I think Weis marketing is to blame.
The circulars tout the 20 cents off per gallon if you spend $100.
It really implies that it is capped at that. But when my $200 gc got me 40 cents off, I looked up on the Weis site for caps on the program and it says:
"Although you can accrue an unlimited amount of Gas Rewards Points, you may only redeem Gas Rewards Points up to the cost of gas. You will not be able to receive cash back with your Gas Rewards Points redemption if you have more points than the cost of gas."