How Much A Link Worth On Your Website

I tested LinkRank and figure out how much my main website will yield from selling text link ads and the result I get is …..2 AVERAGE.

Google: 5
Yahoo: 1,233
AltaVista: 669
AllTheWeb: 601
LR Score: 2

So sad … however, I tested on a few other domains majority are 1. Now, the question is, how reliable is this tool ? Anybody tested ?