The answer in the past has been no.
I find it's simple to make a PDF version using Open Office and a bit of cutting and pasting from the blog, since Paizo has declined to provide the format I'd prefer. And yes, that means that I would purchase a PDF format version from Paizo if such was made available, rather than make my own. OTOH I'm definitely not going to purchase them in a format I don't like or use, such as ePub.
|Vic Wertz Chief Technical Officer|
We don't make web fiction available in PDF form because we've chosen to put our effort into optimizing products for formats that present our works in the best light possible. For works that are primarily running text with few or no illustrations, ePub delivers a better experience to the reader than PDF does. Among other things, ePub readers give you the ability to select font style and size, and often colors and backgrounds, to make reading easier.
We only offer PDFs of the Pathfinder Tales novels because that happens to be a by-product of preparing them for print; the web fiction is never laid out that way, and it would require additional designer and editorial time to make them look as good as our other products in PDF form—and it's just not worth it for a low-cost product that actually functions better *without* that effort. (Try reading your next Tales novel in ePub format, and I think you'll like it much better than reading the PDF.)
ePub readers are available for a whole pile of modern platforms, and most of them are free. See Wikipedia for a (probably incomplete) list.
When it comes to reading an ebook on my computer, I've tried other formats, and find I prefer the PDFs. It's a matter of personal taste I guess.
I haven't tried out ePubs on my new tablet yet, so it's possible I'll find them a superior format there. If so, I'll probably buy the web fiction in that format eventually.
As for the cost/benefit aspects of whether it's worth your while to make PDF versions, Paizo is the company which is doing what seems to be a roaring trade and competing well against even WotC. I'm not going to doubt your analysis and business sense, even if I do wish it was worthwhile for you to do PDF versions.