In addition to surveys, you may be sent advertisements that require you to sign up for several offers before you can receive the reward. Usually on the initial offer, toward the bottom, will be the fine print explaining the terms of the offer. You may delete or ignore any offers you are not interested in. Those types of offers are not considered surveys. A real survey will not require you to purchase anything, you just answer questions, submit your response, and then you are entitled to whatever reward was indicated for the survey.