I assume they were talking about in the past. Like a decade ago or earlier. Though 6 digit ones selling for thousands still seems a bit much unless they were appealing rounded numbers. 5 digits for thousands of dollars was def a thing in the mid 00s.
Things have changed even more. The person with NYC or NewYorkCity IG handle now has a lucrative reportedly 6 figure income from that profile now by promoting NYC things.
http://www.myuin.com