It is pretty daft. Just keep writing to publishers and books stores.
What I found especially annoying recently was that books 4,5,6 and 8 of a series were available as ebooks; also books 1 and 3 of a different series.
Why on earth would I want to buy half a series as ebooks? I cna understand that earlier books may not have been re-formatted yet, but to miss books out midway through is just crazy.