You are planning a survey about health care practices in a population of participants in the past year's US masters' swimming competitions. The survey interview consists of questions about what diet and exercise regimens the respondents pursue. The same questionnaire was used in a general population survey recently. You discover that a randomized experiment using a $10 incentive produced a 20 percentage point increase in response rates. Explain why you expect the incentive to potentially have similar effects, and why it might produce different effects for the survey you are planning.