LLLL is usually worthless for any extension, except for .com. And even for .com most can't sell.
.biz used to sell ok, I sold two for 5 figures, and more for 4 figures. But nowadays .biz is strictly hated by Name Pros community and Sedo. When Sedo hat es it, it makes a difference. We list a noncom domain at Sedo. and Sedo shouts: Buy COM instead, and says |"buy a different domain", on the landing page, and among those different domains you can't find yours.
I sold 3 .info's at Sedo at the beginning of year, for 5K or more each, after waiting more than a decade. Maybe at that time .info was the tld of the month, but I\m not sure. Tld of the month is .COM evey month since I noticed it.
Someone is promoting some tld and we don't know how it works. I see .global's are selling every week for 4-5 figures, by the registry, but I can't sell my .globals, or better keywords in better extensions for a cheaper price. There seems to be a cartel manipulating the market. .io is maybe 30 year old extension and it was almost never used, and someone pushed a button, and people pretend now it is the second best extension. Then someone may unpush that button and many 4 figure purchases may appear in drop lists.