The CoreLogic data shows that what it calls “mega” investors, with a thousand or more homes, bought 3% of houses last year and in 2022, compared with about 1% in previous years, with the bulk of investor purchases made by smaller groups.
I hang out in RE circles. Anecdotally it seems that probably most of these are bought by people who have just 1-20 properties - regular folks who have regular jobs but are looking for ways to supplement their income and hopefully quit their jobs. Owning merely 5 extra homes is not enough to replace income, and in some markets owning even 20 is not enough.
But without a good study that breaks it down, I have no idea if my anecdotal experience is reflective of the nationwide trend.