Lego has been more of a stable currency than most for the past ~10-20 years. They pretty much only go up in value if it's an external IP. I've seriously considered legitimately investing in purchases to sit on in mint condition and resell like, 10 years later for 200% or something.

That said, obviously, $8,888 is above even the most expensive collector stuff I've seen bought and sold. I think the most expensive I remember was like $2,000 for a 1-made large I think Star Wars set or something that had like an actual gold brick or some shit, IDK though it was a long ass time ago.