You can win on the grid but it's very rare to win anything, if you do win it's between $0.10-$5.00.
You will also need to click at least 15 times on the grid to make the daily goal. So if you have done 10 tasks or 2 offers or 5 tasks and 1 offer you will need to click 15 clicks on the grid and do 1 forum visit to meet the daily goal.
Hope this helps :)