Since joining a paid survey locating service I have received invitations to take surveys for CASH nearly every day. Along with those I have received a ton of invitations to take surveys in exchange for a chance to win a drawing for a prize.
Naturally I have gravitated toward the surveys paying cash, but have often taken the surveys for prize entries as well. Overall, I have been disappointed with the results of these surveys and entries.
Between my wife, a friend of ours who is an avid survey taker, and I we have taken and documented over five thousand surveys for drawing entries. From those 5000 drawing entries, we have won a combined total of less than $1000 worth of cash and prizes.
Doing some quick math, the conclusion is that we were paid about $.20 each for taking those surveys, and many of them were long and boring surveys. Thus I would rather take a survey for cash almost every time than any chance to win something.
For more information about where to take surveys for cash (and/or chances to win prizes, if that is your cup of tea) check out my list of paid survey sites.