Video stream count - total streams or monetizable videos

Wanted to share my thoughts on video stream measurement. Today we have companies like comScore give us a tally of total stream count for US. This puts sites such as YouTube way ahead of others (45% stream share). But we've all heard about monetization woes at YouTube, and that's a result of brands not being comfortable putting their ads against unknown and potentially illegal video. The number we should be tracking is "monetizable" videos, i.e. the % of videos that can be legibly monetized. Its not very easy to determine this percentage but keeping track of number of partner videos in a site is a start. Using this measure, the percentage of monetizable videos on YouTube drops dramatically. According to some reports it is between 3-5% of their total videos!