Originally Posted by JD Gumby
Avoid Kobo, then, if that's your preferred method of weeding out the chaff - so many of their previews consist of the title pages, copyright notice, acknowledgements/dedications, and end at the TOCs. Might occasionally get forewords, if the book has any, but that's iffy. :/
I've seen plenty of books at Smashwords that have a preview that only includes the front matter. The preview is a set percentage of the book; if the real content doesn't start within that percentage, you don't get real content in the preview.
No content in preview = no purchase for me. If the author can't be bothered to let me flip through a few pages before buying, I can find other authors who are more accommodating.
So far, I don't do Kobo; last I'd heard, they don't indicate which books are DRM-free. (Or don't have any without DRM. I forget which.) I mostly buy from Smashwords, AllRomanceEbooks, and indie publisher sites.