Besides the # of daily drinks loaded to your Sea Pass the other values are teh C&A balcony discount ($250 for a 7 niter as D+) and the usage of the lounge. In addition, you are provided a robe, welcoming cabin gift, special bath/shower amenities, BOGO SR, interned discounts, reserved seating at certain venues, shareholder's benefit, etc. Also, a member with 340 + night single supplement fare in addition to the balcony discount.
IMO, these benefits really ad up.