From the Terms & Conditions:
1. THIS CERTIFICATE IS VALID FOR ONE DINNER, FOR TWO PEOPLE, AS SHOWN ON THE FRONT OF THIS CERTICATE. IF REDEEMED MORE THAN (2) TWO YEARS PAST THE DATE OF ISSUANCE, THIS CERTIFICATE IS LIMITED TO A DOLLAR VALUE OF $90. ANY CHARGES ABOVE THAT AMOUNT ARE THE RESPONSIBILITY OF THE CERTIFICATE HOLDER.
Doesn't this seem to limit the value?