As the letter states: Yahoo paying FB $100 per user, and not every FB user buying anything worth $100. So the Yahoo offer is much more lucrative.<p>Is it a justifiable to work on this idealogy for an acquisition? Say, for xyz.com, if each user brings in $10 on average (through advertising or sales), should the acquisition value (per user value) be more than that amount?<p>I'm not quite aware of this, so thought I'd ask.