Hamas is clearly trying to provoke an Israeli land response so they can have a 'battle' in which they will claim some sort of victory based on any damage they can inflict, human or otherwise. They have committed the Palestinian people to a crusade of victimology whether or not the Israelis commit ground forces.
The Israelis understand this but they may go anyway, their goal will be to do whatever most weakens Hamas.
Hamas is trying the same logic as that of the terrorists of "Battle of Algers" while overlooking that the motivations behind both sides in the Mideast are far more balanced than they were in North Africa.
I think their timing stinks. Not only is it Ramadan, but the incredible amounts of violence going on in Iraq and Syria is diluting the perception of Palestinian misery, and increase the percepton of how much of it is self-inflicted.
I heard a report on the radio that now that the rockets out of Gaza have the range to hit well inside Israel, they have reached into the West Bank, which is an argument IMHO for Israel to absorb more territory not less.