That's very surprising, to say the least. I assume you were only riding the transit (bus/trolley/subway/El) lines and not any of the Regional Rails. It would be quite difficult to plan a trip that would make a Zone 4 pass worth considering even if you eventually rejected it, since its price is based on the much-higher RRD fare structure.
About 4 years ago I worked out a cost comparison for the late and lamented original version of phillyfriend.com(*). In every standard scenario we came up with, the numbered zone RRD passes were completely out of the ballpark for anyone riding just the transit lines. In some cases you'd have to ride 35 days a month with no days off
to even approach breaking even versus a Transpass.
I don't know your exact situation but most of the bus routes serving 69th Street are no more than Zone 2s. What route(s) were you using for Zone 4? For Zone 2, you'd just need a Transpass that would cover both the El and the first bus zone, then just some change for the second zone.
Remember that a Transpass is good all the way out through Zone 1. But on top of that many people are not aware that a Transpass is also valid for a single zone of travel
anywhere on a transit route. You only pay extra for multiple zones when you are on the same vehicle. If your trip came from the far suburbs and involved another transfer before you reached 69th Street, that transfer would also be covered by the Transpass.
What does put a piece of barbed wire somewhere uncomfortable is the repeated insistence of many SEPTA employees and their website that an RRD pass is
required to ride suburban transit lines beyond Zone 1. Ain't so.
I know I have a reputation for sounding like a small bird ("cheap, cheap") but I would rather carry a CTD Transpass and put up with the hassle of carrying some quarters or Sacs for the zone charges, as opposed to paying train fares to ride a bus or the El. Just one guy's opinion, btw!
(*)The name has since been bought by another tourist info company that does not provide transportation info on any of its sites, sadly.