There is a trend in web video to "shoot with what you have" even if it is a low quality Flip or Web Cam. While I agree with that to an extent,NOTHING trumps quality to help convey your message. Look at these two videos shot under similar conditions. Neither had any additional lighting. Pay attention to not only the images BUT also the difference in AUDIO. FYI - Audio is MORE important than video...(More on that later!)
Webcam on MacBook laptop - $80 (Estimated price...It was built in to a $1000 laptop)
Cliff Mack's Canon 7D - $1800
To be fair there was a little less light on for the webcam because it was shot earlier in the day. The 7D provides full HD and the footage looks excellent BUT the cost puts it out of reach for someone who may just be starting out.
The question becomes what impression do you want to make? What field are you in? For me, I tend to go with the quality because my work is view differently because I provide video services. Either one will help you get your point across! What do you think?