The ratio of 1000:1 merely reflects the relative power of Israel as the occupier against the occupied. It says nothing about the value placed on human life by either side. People not familiar with the Israeli/Palestinian conflict are taken back by the number of Palestinian prisoners released, then more disgusted at the number of Palestinians remaining in Israeli jails.
Palestinian youths throw stones at security forces in Shoafat, E. Jerusalem; none injured (Haaretz)
from the article: Israel and Hamas are both winners and losers in Shalit swap deal