I can read faster than what most people ramble at (which is what people tend to do if it's not well scripted or otherwise rehearsed), so i feel like I'm wasting time waiting for people to get to the point.
And I've seen some vloggers also basically write out what they vlogged about, so you catch the folks who want to watch the video, and the ones who want to read. Some summarize, hitting the main points, others basically go point for point. So, I won't necessarily skip the vlogs if I have something I can read, or if the videos are shorter than 3 minutes. :)
And I know at least one individual who regularly uses DTube to post where he insists he makes more when he includes the spoken word than when he doesn't.