If you count 10 000 x 600 dollars and 10 000 x 40 000 dollars you quickly see which one is on the losing end.
Do you want to compare the GDP of Gaza and Israel? Also, this is the selling price not the production costs and on top of that, the money is recycled back into Israel's economy (rockets developed and made in Israel).
The ability to watch your enemies main weapon and pride shatter against Iron Dome is priceless. They shot thousands of rockets into Israel for 50 days and did practically no damage except for being a nuisance and bringing a similar number of air-strikes on their heads in return. What Artik said is true - the debris is dangerous and can cause some damage too. Many interceptions were happening over my parents house and debris was raining down on them. One rocket motor piece destroyed the neighbors kids swing in their yard - so Hamas can celebrate one destroyed swing in their favor. Hizballa also now watched in horror how their main strategic threat against Israel has been neutralized.
The other system that got less publicity is "Trophy" anti-anti-tank system. Hamas has learned from Hizballa's experience and equipped itself with lots of anti-tank missiles. They failed to destroy a single tank inspite of numerous launches - all destroyed by Trophy.
Well, it TRIES to look real. But most often it tries to make unreal things look real, that's why when you see a totally real looking house start to float off its foundation and fly away, it might be a good indication its cgi. 
They really do that in the air. Puzzling thing to watch.
My brother got married in 2012 during the previous Gaza round. On their wedding album pictures there is one where he and his bride are posing for the camera, but in the background there are two trails of Iron dome shooting up into the skies. This was completely un-intentional which makes it even more hillarious.
