It's great seeing you more active again!
Thanks to this, I now know about the unbinding mechanic! It's cool!
I did some poking around and I see that it is time sensitive and we have a couple of weeks left before the rate increases!
Question: is this the first timed tier that will end soon did I find out about this later than I thought?
It's a bit complicated ;-)
There are two different soulbound sets:
The Chaos Legion Soulbound Set already increased in price twice or thrice (not sure there) and will keep increasing in price until it hits 20x, after that it won't be possible to unbind it ever again.
The Rebellion Soulbound Set is the one I'm working on in the screenshot. It's 20x to unbind right now and will stay at that value until it goes out of print (so probably another ~9 months) at that point the unbind cost will go down to 10x and start increasing again the same as the Chaos Legion Soulbound Set does right now.