Guild Wars 2

I repeat myself, farmed all chambers for 2 days, more than 12 hours a day. In group of 2 is 1 chamber per 5 mins tops ( teleporting, afk smoke, running to the chamber, etc ).
This:
First level chambers drops Mysterious Blue Key
Second level chambers drops Mysterious Green key
Third level chambers drops Mysterious Pink key
= pure BS !

So, after spamming chambers for 2 whole days i ended up with 30 Blue keys, 15 Green keys and 0 Pink keys, please Anet, explain to me how is that even possible ? What is the drop rate, how does the game do it ?
On top of that it seems my guardian wich is on full toughness is 1 shooted. I invested more than 400 G in a character that drops like a mosquito, but i look cool right ? I’ve read somewhere that tower of nightmare is soloable ? Where ? In what dream ? Also please explain how can a group of 3 mobs can put 5 stacks of torment, 5-8 of confusion, immobilize and fear, but we have to use more than 5 skills to go near those numbers …
Oh, i almost forgot, how i am suposed to solo champs or events where are groups of 3 veterans and 1-2 elites in the agro range ?
Why i am forced to make an elementalist/warrior with healing build ? And even with those you must dodge/run.
GG Anet, we have to much gold and you guys run out of ideas how to make us to spend it ?

P.S. Sorry for my bad english Cheers.