Videos are becoming more and more common on the internet, and for some things, like mentos and diet pepsi, they're hard to beat.  For things I'm seriously interested in, though, I prefer text.  Here's why:

• Text goes at my speed.  I read quickly, and certainly faster than people can talk.  If I want to slow down and reread something, I can do that too.
• Video, outside of actual video chats, is not interactive, so I don't get the benefits of being there, being able to interrupt, ask questions, and so on, that can make the 'in person' experience superior to just reading about something.
• Text is searchable and indexable.  I can search within a page, and it's also more likely to be visible to search engines.
• Text is easy to scan and glance at.
• Given the ease of scanning text, it's also easier to filter: "is this something I want to invest more time in reading?".  In the time many videos use for people to simply introduce themselves, I could have already got an idea of a document is worth further perusal.
• Text is easy to manipulate; cutting, pasting, quoting, etc… are all easy.
• I don't have to put on headphones to read text if my wife is sleeping and I'm working late.
• Text has good, and highly visible conventions (various headings and subheadings) for indicating subsections of a large document and what they may be about.