Greed
Because you will put units out of position knowing you risk more than you want to pay but wanting the reward. So you loose valuble units, especialy commanders, for often dubious rewards. Like trying to wall in a gem pool when you know you can finish your defenses behind it in time.

Fear
Because you know the battle is not going to go like you plan. If you let those scouts, flch, and Hc's that show up where it should not be possible for them to be to scare you then you back out of the trap you set. Just to realise later it would have worked just as you thought and not that much more exspensive.
Your judgment fogs to the fact you have to loose units to win and sometimes many.

why should greed and fear kill you?
greed: i have one castle but i want hmmm... 9 more so build up a nice army, and kill all your opponents, raze their villages, takeover their castles, kill their ppl hehehehe... i´m so damn greedy
fear:
sometimes it´s better to fear good players... errr... like me -> so never attack me -> fear me

Well, I got Morbius and Pina killed through greed, and the worst of it was that the information I used to make the call with WASN'T EVEN ACCURATE!
I won't even go into fear....too scary

I think what tserrof meant is that if you let your greed and fear go uncontrolled then you screw up.

Trying to attack to soon, forgetting to patiently plan your attack (or defense), etc.

Greed because I could have built a wall 8 spaces closer and saved my comm but his attack might have bottled up in front of it away from my main force. He had to go around the one I built to get back to his castle.

Fear because when I clocked on he had 50 scouts, 24 hc and 60 falch (aprox) just short (1 space)of my marks. If I had followed my plan I could have used the balistra and marks to clear a path for my Falch, hc and milita into his marks and abs. I had macemen 50, squires 65 and 2 small pike to help my marks. If I took the chance he would not clock on for 2 hours I could clean his clock, save my marks and get my reserves into position while wasting his marks. Then walling with ground troops and Pounding him with 200 marks and 60 balistra. I folded and opted to play safe. He did not clock on for 5 hours. Today I would be looking at taking his castle today if I had been brave.

I make myself sound like a great general here. But it was more that I put the troops where they should be if he was where he should be from the one big Hc I saw.

Then it all fell into place the way it so seldom works out.
The one you look for game after game. Then I blew it because I was not brave enough to risk the loss I would incure if he broke his log on pattern. If he loged on I lost more marks than I could stomach.

So I am saying to the arm chair generals. When you get a once in a great while chance play it to the max.

I have not been attacked by troops greed and fear...but I take your word tserrof...but I have more often been killed by marks and HC

hehe, of course u had the militarty to take that castle, u could have taken it alot sooner, ur really putting alot of thought into the fact that things fell the way they did. after all, all my armies were a very long distance away. only now are all of my HC even arriving to the battle scene.

and yes, i hd fully planned on wiping a huge chunck of ur marks off with that cavalry attack. but due to dubious reasons my chance was blown. so things could have been different for both of us, but u had the chance to take my castle long ago, and i would have been defeated mentally, and i doubt i would have put up a good fight...

With all fairness, don't rely on people loggin in at the right time
I've already had Sugar howl (probably with annoyance than any genuine loss ) once because I logged in at what he thought was an obscure time for me, and Funker missed a narrow window late in the last Game 35.

Not very serious in either case, but the point stands
I can safely announce my geographical location here because if anyone is silly enough to think I DEFINITELY log-in at the same time every day, and never at times like 3:50 am...(like right now! ) - their loss, my gain

The only thing I make sure of is not to move when the enemy is on, as you can get 'nasty surprises'

yes.. moving while ur enemy is on can be a lil bad. ive done it, and wondered where a stack of falcs went... they just dissapeared, so i assumed he moved them away...

but i found them later appearing right at my castle...

Once it's learned, it's a lessone that doesn;t need repeating
And the last two posters have learnt it the hard way...even if it was a long time ago for me