Quoowoovigh83 Supersaver Tickets are not available for every relation and probably not for mountain excursions. This explains why you haven’t seen any discounted prices.
You can find on the ticket if it is a point-to-point ticket who is valid on every train/cable car.
If you buy reservations for the Jungfraujoch, it is better to respect the schedule. The problem is that people with reservations have priority and, if the train is full, people without reservations must wait for the next one. But it depends of the weather and/or the date of travel, it is impossible to say in advance how much people are travelling.
These informations are available on Jungfrau.ch:
The seat reservation is valid for the route Eigergletscher <> Jungfraujoch - Top of Europe or Kleine Scheidegg <> Jungfraujoch - Top of Europe. In addition to the reservation, a valid ticket is needed.
Your benefits
Guaranteed time slot on the Eiger Express from Grindelwald Terminal or the Jungfrau Railway from Kleine Scheidegg
No waiting time when changing to the Jungfrau Railway at the Eiger Glacier station
Guaranteed non-numbered seat on the connection booked on the Jungfrau Railway