Amazon tells me I have 3243 ebooks (including one of yours). I’m sure this includes a substantial number that I got for free (as well as a heck of a lot that I bought cheap when they were on sale). And it doesn’t include ebooks that I’ve bought/acquired from other sources.
Unlike with physical books, I don’t have to worry about where to store them all, and there’s not really a way to sell, trade, or give away the ones I’m finished with, so once I “own” them, they stay owned.