I own a single "real" ereader (as in: a device that I bought purely with the intent of reading books on), a Kobo H2O. I also have some additional eink devices that I bought mostly for reading/storing PDFs and taking notes: reMarkable and Onyx Max 2 - but with their large size, I don't think they qualify as ereaders.
So, despite what my wife seems to think, it doesn't look like I qualify as an ereader collector