I'm 490 ilvl and do LFR every week, coz its an easy source of Valor and I like grabbing gear for my offspec on some bosses. Doesn't mean I "troll" the raid, I just do my job and clear it faster.
I'm not a big fan of the mentality that just because I do normal raids I somehow don't belong in LFR. That's like saying I don't belong in heroics since I no longer need blues.
I do things for other reasons than gear, including valor points and... you know... fun.
Let's not judge an entire group of people based on a few bad eggs.