You've just described one of the many benefits of releasing our mags as CBRs. Since they're just folders of jpgs, it makes it a simple matter for anyone who wants to convert them to something else to do so. If the file began as a PDF, it's much more difficult to convert to other formats and will require the use of software people may not already own. As you say, it only takes you a few minutes. The other way around is much more of a hassle.
Although, I have to wonder...unless you're adding some sort of PDF functionality to the files (like annotate chapters, insert hyperlinks, convert to OCR text, etc), is it really necessary? If it's just because you prefer your PDF reader software to whatever CBR reader software you've tried, I wonder if it might be easier to just find a PDF reader you like that also opens CBR files? Most PDF readers nowadays can open CBR files, just as CBR readers can open PDFs.
Regardless, for personal use, everyone is free to do whatever they like with our files, and are welcome to convert them to whatever format they prefer. CBR is the most open format giving people the most freedom to do as they wish with them. Some scanners (like myself) ask that our files not be converted to a different format and then reuploaded elsewhere in that altered form, but again, for personal use, you're free to turn all the pages into animated gifs if you really want to.
As a scanner/preservationist, I find PDFs problematic since the vast majority of PDF software will resample jpg images when converting them to and from PDF. So a set of files that are scanned as jpgs, converted to PDF, and then extracted back into jpgs, will (with most popular PDF conversion software) not be identical bit-for-bit to the original files. Should this process be carried out more than once, each successive generation gets further and further from the original scanned quality. Even if the change is imperceptible, I still feel more comfortable working in a format where the original files are not altered in any way and don't need to be converted into a different type of file.
That said, I've got no problem with TruePDFs, such as are officially released directly from publishers. Though the images are usually of a compromised quality depending on the resolution the publisher decides to use, the text, being true-type font, will be perfectly sharp at any zoom size, a benefit that no scan is capable of matching. So for reading purposes, they can't be beat. That's beyond the realm of what we can do here, however.