Have you not heard of the Internet, specifically, Youtube?
Kidding aside, while there was a long time period (1994-2006-ish) of "why even bother wasting money on videos", that is now over, and the impact of even something as simple as a lyric video (ie. James LaBrie's "Back on the Ground") being passed around on Youtube is absolutely tangible and definitely worth spending a little dough on.
Yeah, once people figured out HOW to get money from Youtube videos, it's become a new medium for music distribution. Especially things like Vevo. And honestly, there have been a number of bands and albums that I became interested in because, say, RoadRunner recommended I check them out, since I watched something by DT. So it's becoming a very useful tool for spreading music awareness.
It's crazy how different the music industry has become in just a few years. I remember artists complaining about how they couldn't get a record deal, just a few months ago. Now, artists are refusing record deals, because they know they'll actually make more money if they promote themselves. It's an interesting time to be a musician.