1) No, that is not wrong. I do it on my WD simply because I'm in need of money and picking up blues actually yields a decent enough money for me to pick it up. I could see myself leaving them on the groudn once I got enough gold and am basically just farming rares looking for that amazing one.
2) After you kill siegebreaker, just go and do the rest of the act. Hell, re-run the whole act, it would probably yield the best exp/money than anything else. Also, watch this video, and follow his a3 route.
His guides has good information. If you havent watched his WD yet I suggest you do so.
3) I'd just say kill everything that you can. White monsters can actually add up. I hear that most people find their legendaries from white monsters so I just like to kill everything on screen. Plus, it makes me feel badass.
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2) After you kill siegebreaker, just go and do the rest of the act. Hell, re-run the whole act, it would probably yield the best exp/money than anything else. Also, watch this video, and follow his a3 route.
Part 1:
http://www.youtube.com/watch?v=S0r2EzZDngQ&feature=plcp
Part 2:
http://www.youtube.com/watch?v=VcY9mm-D7qs&list=UUefx9RJZBwayEBO-aLM6acg&index=9&feature=plcp
His guides has good information. If you havent watched his WD yet I suggest you do so.
3) I'd just say kill everything that you can. White monsters can actually add up. I hear that most people find their legendaries from white monsters so I just like to kill everything on screen. Plus, it makes me feel badass.