Well of course, however the way Tapas displays pages, if you export PNG's of varying "sizes" (for example if you export at 200dpi vs 300dpi), it will display those pages as different sizes. So in my case, the better option was to export a JPG that had the same resolution/size/whatever, but took up less storage space.
I mean it's not ideal, but I would rather have the occasional slightly-lower-quality image, that basically no one will notice, than having my pages display at random different sizes.
If your .JPG exports are so crusty that you can tell that they're JPG's then you're doing something wrong.