Why has there never been a Dirty Duck book?

The publishing world has always looked to me for ideas.

As for claims that Dirty Duck isn’t a popular enough character to justify a book collection, I offer this in refutation: Rip Kirby, Vol. 10

Seriously, are there really fans of Rip Kirby out there who are buying ten volumes of this strip? Or four volumes of Buz Sawyer? Or five volumes of Johnny Hazard?

The complete reprint series of the Li’l Abner daily strips – if not the greatest comic strip in American history, at least in the top five – ended abruptly when Kitchen Sink Press went out of business. The years 1962-1976 remain uncollected, as well as ALL the Sunday strips.

Yet Rip Kirby lives on.

I’m a huge fan of the New Zealand cartoon “Footrot Flats,” which has been collected into books but like so many DownUnda things, has had limited export. So the books aren’t found in any shared form, pay or free, and they range from pricey to insanely expensive. I corresponded with Murray Ball about publishing a complete US edition, but nothing ever came of it.

Li’l Abner Sunday strips have been collected up to 1950. In teeny tiny hard-to-read format, 'tis true. But nevertheless you can collect them.

Can you explain this one?