Really, I should be asking "what simple thing am I missing?"
No, wait, I should instead post something along the lines of I have a quad 8xxx card and I'm only getting yGH, whatsupyo?!?!
If you are solo mining, you don't get paid for "shares" - you only get "paid" when you solve a block. And even then, the chance to solve a block solo is astronomical unless you are putting out 60,000 Mh/s (60 GH/s) or more. Even then it's still about a week's time to get a block. It's a lottery and really not worth doing unless you are pumping out some serious Gigahashes.
Join a pool - much more profitable for smaller miners.
What rig do you have running?