Timmytoastman: Sorry our target has been filled!
I think WGTicon touched on this before, I will repeat based on memory.....
Let's say a particular survey is looking for 100 participants ( arbitrary number just for an example) and 150 people start filling it out, if 100 people finish the survey before you do then you get the "sorry our target has been filled" message.
Makes sense to me when I look at it that way at least, could have just had 3 spots left and 10 people were doing it at the same time but the first 3 to complete the survey filled up the requirements, just another example.
Hope it helps