CainIV - 6:10 am on Jul 23, 2011 (gmt 0)

At what point do you decide whether it is worth it to spend the time and energy to purse the link though the phone or other methods?

25% Hunch
50% Metrics of the potential linking site itself
25% Time available in total for link building

I am up most nights until 2:00 am writing link request emails, haven't shaved in about two weeks, don't really remember what my son's face looks like (a bad thing), nor my wife's face (a good thing).

You should have scripts for this purpose....

I guess what I am asking is, how do you decide how much time and energy a particular link is worth?

Metrics analysis.