That's a very good point! Add to that YT's abysmal organization of subscribed channels and their terrible recommendation engine. I have to say I really like it.
Visiting youtube, I could swear that the recommendations Youtube is trying to shove my way only change after several weeks or sometimes even months, it is always the same 8 videos on top of the front page for very long periods.
It starts to get somewhat relevant after I watch something, but then it looks like their recommendation engine does nothing more than "Recommend to user x the n most popular videos of roughly the same category as the last video user x watched" with a little bit of shuffling 1-3 videos from a larger set between those, sometimes, and that appears to be it.