I bought the Crime Chronicles as downloads and I'd probably buy some of the others as downloads too - if they were a sensible price. I'm not really surprised they don't sell all that well at the price they are, to be perfectly honest - nothing to do with quality just that the comics are a niche enough market as it is and there is probably a little too much stuff released such as GN's and Other Stuff, so I save my pennies and the only tie-in stuff I really get (apart from the Case Files and of course the Prog and Meg, as well as downloads of those...) is Dredd RPG related stuff - and even that is getting harder and harder to justify.
I did like the novels, though.