There is not a single Israeli settlement in Gaza. Their GDPPC is some 5000USD, which, for comparison, is almost twice that of Haiti. Insane amounts of international funding goes into Gaza every year. In fact, they receive the highest amount of international aid per capita on earth (more than 500USD/Capita!). In addition to that Israel usually provides both electricity and water at discounted rates, meaning almost everyone has access to both.
The Gazan leadership has been given numerous chances and opportunities for peace, yet over and over they chose to slaughter the innocent. The aid money, instead of buying food, funding education and healthcare goes to buying weapons, rockets and indoctrinating the next generation of genocidal terrorist.