I get items that are worth something all the time. If everything I have on the GAH sold right now I'd make ~150 mill. And then there's the RMAH. A few days ago I found 3 andariel's visages - only one was worth more than a couple million (got 18 for it), but the vile ward I found the same day made up for it - got 50mill. And I'm not stacking MF either, I have 1-2 pieces with some, but I didn't go hunting them. Aside from that, I just have my PL MF (PL 35 ish) and NV stacks.
While whether the time we spend to get whatever we get is worth it is entirely subjective, I maintain that if you feel you're getting nothing, you're probably doing something wrong. Read your class forum at diablofans, watch some streams of geared people playing your class, and
check this out, it could be a big help for people who have trouble recognizing good rares.