Lol.. e cams are seriously not that heavy.. They are getting smaller and more efficient.. Just look at the ones in the new sails these days..
http://www.neilpryde.com/sails-2009/sail-technology/ultracam.htmlThe cams help power the sail earlier and holds it in better.. Thus overcoming the problem of weight..
Its just like saying having a V8 engine and a V12 in a car..
V12 is heavier but then because it gave the car so much power it overcomes the issue of weight factor, allowing it to go faster..