I think was 3 or 4 seasons ago. As I remember it, we were told of the restructuring and given a choice to either stay put and pay the new donation rate or be relocated to a lower donation level as available. I chose to stay put as the new donation rate was not a huge burden for me at that time.
This year, money is particularly tight, and I was going to give up the tickets altogether, but my fellow Tide fans convinced me I could sub-lease them (selling the whole kit-n-kaboodle) without losing my Tide Pride membership. That worked out great and has enabled me to stay in Tide Pride this season. Hopefully next year things will be a bit more financially happy around here and I won't have to do this again, but at least I know it's easy to do if need be.
I'm glad that's working out for you. Unless you're just hard up against the proverbial wall, or have simply lost interest (can't imagine that ever happening), do NOT give up your spot. If you do, and you ever want it back, you'll be starting from ground zero. From that point, you're going to give up either a lot of time waiting in line, or a lot of money, or both.
If there's any way at all to avoid that, do it.