Sample size has received little attention in the growing literature on consequentiality. An online single-bounded dichotomous choice field study dealing with underwater turbines, a part of participants is provided with information on the number of persons that will participate to the survey, where the information varies across participants. Our main result is that the information on sample size has no effect on willingness-to-pay, which suggests that consequential binary contingent valuation studies can still ensure incentive-compatible behavior when an expected gain from voting becomes very small.