Yep, it seems silly to me to sell when you still enjoy going, even if prices have gone up. Not to mention with all the cool stuff coming in the next few years and the dream that they will open a 5th gate someday in response to Universal's expansion. Hopefully they have cheap resale points and not direct points so they don't take a big hit. But depending on how many points they have, if I were in their shoes I would just try something a little different.
Maybe try to go for a little longer each trip, but a little less often. if it was once every year, then maybe use banking/borrowing to do a trip every 1.5 years but a few days longer. That would save 1/3 on travel costs, and tickets to the park cost less the more days you go. So there would be savings there as well doing 2 trips with an extra park day or two vs 3 trips with slightly less park days.
Or you can keep the same number of park days and then you are saving 1/3 the total cost on the tickets over time as well. You could even do a resort only stay (if you like that) every once in a while and skip the parks, that would be a big savings with no park costs for that year as well.