You will always see videos of channels you are subscribed to in the subs feed. We added the bell a while back for proactive notifications which not all viewers wanted to receive. The bell gives viewers a choice. More here: http://goo.gl/XLDtz4
The bell is useless, a LOT of YouTubers now have taken a daily or multiple times daily upload schedule. I don't need notifications every day at 3pm, I trust that the video will be there. The bell works for more unscheduled channels but then YouTube stops being lucrative for them.
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