I don't think you're crazy! :) If you choose to follow someone on Twitter it's more than likely going to be someone you know, have heard of, or someone who has the same interests/career as you.
You know that the tweets coming from these people are going to be not only relevant to what you're interested in, but also interesting enough for someone to bother to Tweet the link.
I also agree that Time is a factor and definitely does count as a call to action. Especially as more people start using Apps such as Twhirl for real time Tweeting.