Over half the time these "domain spans" are actually used for the word or letters before the TLD. Some keep promoting these sales as "hacks" (I hate that now-obsolete term) when the majority are not. I remember Sedo sold a pile of LL domains that created spanned words, but virtually all of them were eventually used as the LL acronym.
For example Berl is both a first name and a surname, so there is a chance someone bought it for the name and not the spanned domain. Or maybe not, it's around 60-40.