Because it makes killing enemies rewarding (they won't show up anytime soon...)
However if you manage to get 2 of your guys out alive, suprise, you have backup
![Smile :)](./images/smilies/icon_e_smile.gif)
Most of the time, though, I use rally for new squad members to join the squad...
But the only time I used this Rally Point system to its fullest was in Silent Eagle... we had some good Chinook pilots...
Note I only played a couple of rounds as SL, though...