Before last January 2016 update events (keycard battles they were) used to be a decent source of quick cash or quick training. Save up 50 energy points, boom, you got $100K+, or a nice dollop of training droids. Now you spend 2x24 = 48 points (pretty much same amount) and get back, oh, a whole awesome amount of $16K. Yeah, you can get lucky and draw an occasion x2 or even x3, but that does not happen often in my experience. You will get almost as much cash and training when hunting for gear, where you also get other goodies. I pretty much stopped using events.